Workers Compensation Class Code
3507 - Construction or Agricultural Machinery Manufacturing

The description for the NCCI Workers Compensation Class Code 3507 - Construction or Agricultural Machinery Manufacturing is:

mfg. of agricultural machinery.

The related GL Class Code(s) for NCCI Workers Compensation Class Code 3507 - Construction or Agricultural Machinery Manufacturing is:

The related SIC Code(s) for NCCI Workers Compensation Class Code 3507 - Construction or Agricultural Machinery Manufacturing is:

Description for 3531 Construction Machinery and Equipment

Establishments primarily engaged in manufacturing heavy machinery and equipment of a type used primarily by the construction industries, such as bulldozers; concrete mixers; cranes, except industrial plant overhead and truck-type cranes; dredging machinery; pavers; and power shovels. Also included in this industry are establishments primarily engaged in manufacturing forestry equipment and certain specialized equipment, not elsewhere classified, similar to that used by the construction industries, such as elevating platforms, ship cranes and capstans, aerial work platforms, and automobile wrecker hoists. Establishments primarily engaged in manufacturing mining equipment are classified in Industry 3532; those manufacturing well-drilling machinery are classified in Industry 3533; those manufacturing industrial plant overhead traveling cranes are classified in Industry 3536; and those manufacturing industrial truck-type cranes are classified in Industry 3537.

• Aerial work platforms, hydraulic or electric truck or carrier mounted
• Aggregate spreaders
• Asphalt plants, including travel-mix type
• Automobile wrecker hoists
• Backfillers, self-propelled
• Backhoes
• Ballast distributors (railway track equipment)
• Batching plants, bituminous
• Batching plants, for aggregate concrete and bulk cement
• Blades for graders, scrapers, dozers, and snowplows
• Breakers, paving
• Buckets, excavating: e.g., clamshell, concrete, dragline, drag scraper,
• Bulldozers, construction
• Cab, construction machinery
• Capstans, ship
• Carriers, crane
• Chip spreaders, self-propelled
• Chippers, commercial: brush, limb, and log
• Concrete buggies, powered
• Concrete grouting equipment
• Concrete gunning equipment
• Concrete plants
• Construction machinery, except mining
• Cranes, construction
• Cranes, except industrial plant
• Crushers, mineral: portable
• Derricks, except oil and gas field
• Distributors (construction machinery)
• Ditchers, ladder: vertical boom or wheel
• Dozers, tractor mounted: material moving
• Draglines, powered
• Drags, road (construction and road maintenance equipment)
• Dredging machinery
• Excavators: e.g., cable, clamshell, crane, derrick, dragline, power
• Extractors, piling
• Finishers and spreaders, construction
• Finishers, concrete and bituminous: powered
• Grader attachments, elevating
• Graders, road (construction machinery)
• Grapples: rock, wood, etc.
• Grinders, stone: portable
• Hammer mills (rock and ore crushing machines), portable
• Hammers, pile driving
• Line markers, self-propelled
• Locomotive cranes
• Log splitters
• Logging equipment
• Mixers: e.g., concrete, ore, sand, slag, plaster, mortar, bituminous
• Mortar mixers
• Mud jacks
• Pavers
• Pile driving equipment
• Planers, bituminous
• Plaster mixers
• Plows, construction: excavating and grading
• Post hole diggers, powered
• Power cranes, draglines, and shovels
• Pulverizers, stone: portable
• Railway track equipment: e.g., rail layers, ballast distributors
• Rakes, land clearing: mechanical
• Road construction and maintenance machinery
• Rock crushing machinery, portable
• Rollers, road
• Rollers, sheepsfoot and vibratory
• Sand mixers
• Scarifiers, road
• Scrapers, construction
• Screeds and screeding machines
• Screeners, portable
• Ship cranes and derricks
• Ship winches
• Shovel loaders
• Shovels, power
• Silos, cement (batch plant)
• Slag mixers
• Snowplow attachments
• Soil compactors: vibratory
• Spreaders and finishers, construction
• Subgraders, construction equipment
• Subsoiler attachments, tractor-mounts
• Surfacers, concrete grinding
• Tampers, powered
• Tamping equipment, rail
• Teeth, bucket and scarifier
• Tractors, construction
• Tractors, crawler
• Tractors, tracklaying
• Trenching machines
• Trucks, off-highway
• Vibrators for concrete construction
• Wellpoint systems
• Winches, all types
• Work platforms, elevated

Description for 3535 Conveyors and Conveying Equipment

Establishments primarily engaged in manufacturing conveyors and conveying equipment for installation in factories, warehouses, mines, and other industrial and commercial establishments. Establishments primarily engaged in manufacturing farm elevators and conveyors are classified in Industry 3523; those manufacturing passenger or freight elevators, dumbwaiters, and moving stairways are classified in Industry 3534; and those manufacturing overhead traveling cranes and monorail systems are classified in Industry 3536.

• Belt conveyor systems for general industrial use
• Bucket type conveyor systems for general industrial use
• Buckets, elevator or conveyor for general industrial use
• Conveyor systems for general industrial use
• Mine conveyors
• Overhead conveyor systems for general industrial use
• Passenger baggage belt loaders
• Pneumatic tube conveyor systems for general industrial use
• Robotic conveyors for general industrial use

Description for 3532 Mining Machinery and Equipment, Except Oil and Gas Field Machinery and Equipment

Establishments primarily engaged in manufacturing heavy machinery an equipment used by the mining industries, such as coal breakers, mine cars, mineral cleaning machinery, concentration machinery, core drills, coal cutters, portable rock drills, and rock crushing machinery. Establishments primarily engaged in manufacturing construction machinery are classified in Industry 3531; those manufacturing welldrilling machinery are classified in Industry 3533; and those manufacturing coal and ore conveyors are classified in Industry 3535.

• Amalgamators (metallurgical and mining machinery)
• Auger mining equipment
• Bits, rock: except oil and gas field tools
• Cages, mine shaft
• Car dumpers, mining
• Clarifying machinery, mineral
• Classifiers, metallurgical and mining
• Cleaning machinery, mineral
• Coal breakers, cutters, and pulverizers
• Concentration machinery (metallurgical and mining)
• Crushers, mineral: stationary
• Drills and drilling equipment, mining: except oil and gas field
• Drills, core
• Drills, rock: portable
• Feeders, ore and aggregate
• Flotation machinery (mining machinery)
• Grinders, stone: stationary
• Hammer mills (rock and ore crushing machines), stationary
• Loading machines, underground: mobile
• Mining cars and trucks (dollies)
• Mining equipment, except oil and gas field: rebuilding on a factory
• Mining machinery and equipment except oil and gas field
• Ore crushing, washing, screening, and loading machinery
• Pellet mills (mining machinery)
• Plows, coal
• Pulverizers, stone: stationary
• Scraper loaders, underground
• Screeners, stationary
• Sedimentation machinery, mineral
• Separating machinery, mineral
• Shuttle cars, underground
• Stamping mill mining machinery
• Washers, aggregate and sand: stationary type

Description for 3533 Oil and Gas Field Machinery and Equipment

Establishments primarily engaged in manufacturing machinery and equipment for use in oil and gas fields or for drilling water wells, including portable drilling rigs. Establishments primarily engaged in manufacturing offshore oil and gas well drilling and production platforms are classified in Industry 3731.

• Bib, rock: oil and gas field tools
• Derricks, oil and gas field
• Drill rigs, all types
• Drilling tools for gas, oil, or water wells
• Gas well machinery and equipment
• Oil and gas field machinery and equipment
• Water well drilling machinery
• Well logging equipment
• Well surveying machinery

Description for 3536 Overhead Traveling Cranes, Hoists, and Monorail Systems

Establishments primarily engaged in manufacturing overhead traveling cranes, hoists, and monorail systems for installation in factories, warehouses, marinas, and other industrial and commercial establishments. Establishments primarily engaged in manufacturing cranes except industrial types, automobile wrecker hoists, and aerial work platforms are classified in Industry 3531, and those manufacturing aircraft loading hoists are classified in Industry 3537.

• Boat lifts
• Cranes, overhead traveling
• Davits
• Hoists, except aircraft loading and automobile wrecker hoists
• Hoists hand
• Hoists, overhead
• Monorail systems

Description for 3523 Farm Machinery and Equipment

Establishments primarily engaged in manufacturing farm machinery and equipment, including wheel tractors, for use in the preparation and maintenance of the soil; planting and harvesting of the crop; preparing crops for market on the farm; or for use in performing other farm operations and processes. Included in this industry are establishments primarily engaged in manufacturing commercial mowing and other turf and grounds care equipment. Establishments primarily engaged in manufacturing farm handtools are classified in Industry Group 342, and those manufacturing garden tractors, lawnmowers and other lawn and garden equipment are classified in Industry 3524.

• Agricultural implements and machinery
• Ammonia applicators and attachments (agricultural machinery)
• Bale throwers
• Balers, farm: e.g., hay, straw, cotton
• Barn cleaners
• Barn stanchions and standards
• Blowers and cutters, ensilage
• Blowers, forage
• Brooders
• Cabs, agricultural machinery
• Calf savers (farm equipment)
• Cattle feeding, handling, and watering equipment
• Cattle oilers (farm equipment)
• Chicken brooders
• Cleaning machines for fruits, grains and vegetables: farm
• Combines (harvester-threshers)
• Conveyors, farm (agricultural machinery)
• Corn pickers and shellers, farm
• Corrals, portable
• Cotton picker and stripper harvesting machinery
• Cream separators, farm
• Crop driers, farm
• Crushers, feed (agricultural machinery)
• Cultivators, agricultural field and row crop
• Cutters, ensilage
• Dairy equipment, farm
• Drags (agricultural equipment)
• Driers: grain, hay, and seed (agricultural implements)
• Dusters, mechanical: agricultural
• Elevators, farm
• Farm machinery and equipment
• Feed grinders, crushers, and mixers (agricultural machinery)
• Feeders, chicken
• Fertilizing machinery, farm
• Field type rotary tillers (agricultural machinery)
• Fruit, vegetable, berry, and grape harvesting machines
• Gates, holding (farm equipment)
• Grading, cleaning, and sorting machines: fruit, grain, and vegetable
• Grain drills, including legume planters (agricultural machinery)
• Grain stackers
• Greens mowing equipment
• Grounds mowing equipment
• Hair clippers for animal use, hand and electric
• Hammer and roughage mills (agricultural machinery)
• Harrows: disc, spring, and tine
• Harvesting machines
• Haying machines: mowers, rakes, loaders, stackers, balers, presses,
• Hog feeding, handling, and watering equipment
• Hulling machinery, agricultural
• Incubators, except laboratory and infant
• Irrigation equipment, self-propelled
• Land rollers and levelers (agricultural machinery)
• Listers
• Loaders, farm type (general utility)
• Milking machines
• Mowers and mower-conditioners, hay
• Peanut combines, diggers, packers, and threshers (agricultural
• Planting machines, agricultural
• Plows, agricultural: disc, moldboard, chisel, etc.
• Potato diggers, harvesters, and planters (agricultural machinery)
• Poultry brooders, feeders, and waterers
• Poultry vision control devices
• Presses and balers, farm: hay, cotton, etc.
• Rakes, hay (agricultural machinery)
• Rotary hoes (agricultural machinery)
• Roughage mills (agricultural machinery)
• Seeders (agricultural machinery)
• Separators, grain and berry: farm
• Shears, sheep: power
• Shellers, nut (agricultural machinery)
• Shredders (agricultural machinery)
• Silo fillers (agricultural machinery)
• Soil pulverizers and packers (agricultural machinery)
• Sorting machines for agricultural products
• Sprayers, hand: agricultural
• Spraying machines (agricultural machinery)
• Spreaders, fertilizer
• Tobacco curers
• Tractors, wheel: farm type
• Trailers and wagons, farm
• Transplanters
• Turf equipment, commercial
• Vine pullers
• Volume guns (irrigation equipment)
• Water troughs
• Weeding machines, farm
• Windmills for pumping water (agricultural machinery)
• Windrowers (agricultural machinery)

Description for 3567 Industrial Process Furnaces and Ovens

Establishments primarily engaged in manufacturing industrial process furnaces, ovens, induction and dielectric heating equipment, and related devices. Establishments primarily engaged in manufacturing bakery ovens are classified in Industry 3556; those manufacturing cement, wood, and chemical kilns are classified in Industry 3559; those manufacturing cremating ovens are classified in Industry 3569; and those manufacturing laboratory furnaces and ovens are classified in Industry 3821.

• Calcining kilns (industrial furnaces)
• Ceramic kilns and furnaces
• Core baking and mold drying ovens
• Dielectric heating equipment
• Distillation ovens, charcoal and coke
• Driers and redriers, industrial process
• Enameling ovens
• Furnaces, industrial process
• Heat treating ovens
• Heating equipment, induction
• Heating units and devices, industrial electric
• Incinerators, metal domestic and commercial
• Induction heating equipment
• Infrared ovens, industrial
• Japanning ovens
• Kilns except cement, chemical, and wood
• Lacquering ovens
• Metal melting furnaces, industrial
• Ovens, industrial process except bakery
• Paint baking and drying ovens
• Radiant heating systems, industrial process: e.g., dryers, cookers
• Rubber curing ovens
• Sherardizing ovens
• Smelting ovens
• Vacuum furnaces and ovens

Description for 3537 Industrial Trucks, Tractors, Trailers, and Stackers

Establishments primarily engaged in manufacturing industrial trucks, tractors, trailers, stackers (truck type), and related equipment, used for handling materials on floors and paved surfaces in and around industrial and commercial plants, depots, docks, airports, and terminals. Establishments primarily engaged in manufacturing motor vehicles and motor vehicle type trailers are classified in Industry Group 371; those manufacturing farm type wheel tractors are classified in Industry 3523; those manufacturing tractor shovel loaders and tracklaying tractors are classified in Industry 3531; and those manufacturing wood pallets and skids are classified in Industry 2448.

• Adapters for multiweapon rack loading on aircraft
• Aircraft engine cradles
• Aircraft loading hoists
• Boat cradles
• Bomb lifts
• Bomb trucks
• Cabs for industrial trucks and tractors
• Cars, industrial: except automotive cars and trucks and mining cars
• Containers, air cargo: metal
• Cranes, mobile industrial truck
• Die and strip handlers
• Docks, loading: portable, adjustable, and hydraulic
• Dollies (hand or power trucks), industrial: except mining
• Drum cradles
• Engine stands and racks, metal
• Forklift trucks
• Hoists, aircraft loading
• Hoppers, end dump
• Hospital dollies
• Industrial truck cranes
• Industrial trucks and tractors
• Laundry containers on wheels
• Lift trucks, industrial: fork, platform, straddle, etc.
• Mobile straddle carriers
• Pallet assemblies for landing mats
• Pallet loaders and unloaders
• Palletizers and depalletizers
• Pallets, metal
• Platforms, cargo: metal
• Ramps, aircraft-loading
• Ramps, loading: portable, adjustable, and hydraulic
• Skid boxes, metal
• Skids, metal
• Stackers, power (industrial truck stackers)
• Shacking carts
• Stacking machines, automatic
• Stands, ground servicing aircraft
• Straddle carriers, mobile
• Tables, lift: hydraulic
• Tractors, industrial: for use in plants, depots, docks, and terminals
• Truck trailers for use in plants, depots, docks, and terminals
• Trucks, industrial (except mining): for freight, baggage, etc.
• Tunnel kiln cars

Description for 3565 Packaging Machinery

Establishments primarily engaged in manufacturing packaging machinery, including wrapping and bottling machinery.

• Aerating machines, for beverages
• Bag opening, filling and closing machines
• Bottling machinery: washing, sterilizing, filling, capping, and labeling
• Bread wrapping machines
• Carton packing machines
• Label moisteners, industrial type
• Labeling machinery, industrial type
• Packaging machinery
• Wrapping machines

Description for 3554 Paper Industries Machinery

Establishments primarily engaged in manufacturing machinery for the pulp, paper, and paper product industries. Establishments primarily engaged in manufacturing printing trades machinery are classified in Industry 3555.

• Bag and envelope making machinery (paper machinery)
• Box making machines for paper boxes
• Coating and finishing machinery, paper
• Corrugating machines for paper
• Cutting and folding machines, paper
• Die-cutting and stamping machinery (paper converting machinery)
• Folding machines, paper: except office machines
• Fourdrinier machines (paper manufacturing machinery)
• Paper mill machinery: e.g., plating, slitting, waxing
• Paper product machines, except printing machines
• Pulp mill machinery
• Sandpaper manufacturing machines

Description for 3559 Special Industry Machinery, Not Elsewhere Classified

Establishments primarily engaged in manufacturing special industry machinery, not elsewhere classified, such as smelting and refining equipment, cement making, clayworking, cotton ginning, glass making, hat making, incandescent lamp making, leather working, paint making, rubber working, cigar and cigarette making, tobacco working, shoe making, and stone working machinery, and industrial sewing machines, and automotive maintenance machinery and equipment.

• Ammunition and explosives loading machinery
• Anodizing equipment (except rolling mill lines)
• Bag sewing and closing machines (industrial sewing machines)
• Balancing equipment, automotive wheel
• Boot making and repairing machinery
• Brick making machines
• Broom making machinery
• Buttonhole and eyelet machines and attachments, industrial
• Cement making machinery
• Chemical kilns
• Chemical machinery and equipment
• Cigarette and cigar making machines
• Clayworking and tempering machines
• Concrete products machinery
• Control rod drive mechanisms for use on nuclear reactors
• Cork working machinery
• Degreasing machines, automotive (garage equipment)
• Degreasing machines, industrial
• Desalination equipment
• Die and hub cutting equipment (jewelry manufacturing)
• Drying kilns, lumber
• Electric screening equipment
• Electron tube making machinery
• Electroplating machinery and equipment, except rolling mill lines
• Foundry machinery and equipment
• Frame straighteners, automotive (garage equipment)
• Fur sewing machines
• Ginning machines, cotton
• Glass making machinery: blowing, molding, forming, grinding, etc.
• Hat making and hat renovating machinery
• Jewelers' machines
• Kilns: cement, wood, and chemical
• Lamp making machinery, incandescent
• Leather working machinery
• Metal finishing equipment for plating, except rolling mill lines
• Metal pickling equipment, except rolling mill lines
• Metal smelting and refining machinery, except furnaces and ovens
• Nuclear reactor control rod drive mechanisms
• Optical lens machinery
• Ozone machines
• Packup assemblies (wheel overhaul)
• Paint making machinery
• Petroleum refinery equipment
• Pharmaceutical machinery
• Plastics working machinery
• Pottery making machinery
• Robots, plastics: for molding and forming
• Rubber products machinery
• Rubber working machinery
• Scouring machines, tannery
• Semiconductor manufacturing machinery
• Sewing machines and attachments, Industrial
• Shoe making and repairing machinery
• Silver recovery equipment, electrolytic
• Stone tumblers
• Stone working machinery
• Synthetic filament extruding machines
• Tannery machines
• Tile making machines
• Tire grooving machines
• Tire retreading machinery and equipment
• Tire shredding machinery
• Tobacco products machinery
• Wheel mounting and balancing equipment, automotive
• Wood drying kilns
• Zipper making machinery

Description for 3549 Metalworking Machinery, Not Elsewhere Classified

Establishments primarily engaged in manufacturing metalworking machinery, not elsewhere classified. Establishments primarily engaged in manufacturing automotive maintenance equipment are classified in Industry 3559.

• Assembly machines, e.g., rotary transfer, in-line transfer, special
• Coil winding machines for springs
• Coilers (metalworking machines)
• Cradle assemblies (wire making equipment)
• Cutting up lines
• Draw benches
• Drawing machinery and equipment except wiredrawing dies
• Marking machines, metalworking
• Pail mills
• Propeller straightening presses
• Rotary slitters (metalworking machines)
• Screwdowns and boxes
• Screwdriving machines
• Wiredrawing and fabricating machinery and equipment, except dies

Description for 3547 Rolling Mill Machinery and Equipment

Establishments primarily engaged in manufacturing rolling mill machinery and processing equipment for metal production, such as cold forming mills, structural mills, and finishing equipment.

• Bar mills
• Billet mills
• Blooming and slabbing mills
• Cleaning lines, electrolytic (rolling mill equipment)
• Cold forming type mills (rolling mill machinery)
• Ferrous and nonferrous mill equipment, auxiliary
• Finishing equipment, rolling mill
• Galvanizing lines (rolling mill equipment)
• Hot strip mill machinery
• Mill tables (rolling mill equipment)
• Picklers and pickling lines, sheet and strip (rolling mill equipment)
• Pipe and tube mills
• Plate rolling mill machinery
• Rod mills (rolling mill equipment)
• Roller levelers (rolling mill machinery)
• Rolling mill machinery and equipment
• Rolls for rolling mill machinery, machined
• Steel rolling machinery
• Straightening machinery (rolling mill equipment)
• Structural mills (rolling mill machinery)
• Tube mill machinery

Description for 3743 Railroad Equipment

Establishments primarily engaged in building and rebuilding locomotives (including frames and parts, not elsewhere classified) of any type or gauge; and railroad, street, and rapid transit cars and car equipment for operation on rails for freight and passenger service. Establishments primarily engaged in manufacturing mining cars are classified in Industry 3532. Repair shops, owned and operated by railroads or local transit companies, repairing locomotives or cars for their oWn use are classified in Transportation, Major Groups 40 and 41. Establishments primarily engaged in repairing railroad cars on a contract or fee basis are classified in Transportation, Industry 4789; and those repairing locomotive engines on a contract or fee basis are classified in Services, Industry 7699.

• Brakes, railway: air and vacuum
• Cars and car equipment, freight or passenger
• Dining cars and car equipment
• Engines, steam (locomotives)
• Freight cars and car equipment
• Industrial locomotives and parts
• Interurban cars and car equipment
• Locomotives, locomotive frames, and parts
• Lubrication systems, locomotive
• Mining locomotives and parts
• Railroad car rebuilding
• Railway motor cars
• Rapid transit cars and equipment
• Sleeping cars, railroad
• Streetcars and car equipment
• Switching locomotives and parts, electric and nonelectric
• Tank freight cars and car equipment
• Tenders, locomotive
• Trolley buses, trackless

Description for 3499 Fabricated Metal Products, Not Elsewhere Classified

Establishments primarily engaged in manufacturing fabricated metal products, not elsewhere classified, such as fire or burglary resistive steel safes and vaults and similar fire or burglary resistive products; and collapsible tubes of thin flexible metal. Also included are establishments primarily engaged in manufacturing metal boxes, metal ladders, and metal household articles, such as ice cream freezers and ironing boards. Establishments primarily engaged in manufacturing concrete burial vaults are classified in Industry 3272, and metal burial vaults are classified in Industry 3995. Establishments primarily engaged in manufacturing advertising novelties are classified in Industry 3993.

• Aerosol valves, metal
• Ammunition boxes metal
• Aquarium accessories, metal
• Automobile seat frames, metal
• Bank chests, metal
• Barricades, metal
• Book ends, metal
• Boxes for packing and shipping, metal
• Chair frames, metal
• Chests, fire or burglary resistive: metal
• Collapsible tubes for viscous products, metal
• Doors, safe and vault: metal
• Drain plugs, magnetic: metal
• Drill stands, metal
• Ferrules, metal
• Fountains, metal (except drinking)
• Friction material, made from powdered metal
• Furniture parts, metal
• Hoops, metal: other than wire
• Ice cream freezers, household, nonelectric: metal
• Ironing boards, metal
• Ladder assemblies, combination workstand: metal
• Ladders, metal: portable
• Linings, safe and vault: metal
• Locks, safe and vault: metal
• Machine bases, metal
• Magnets, permanent: metallic
• Marine horns, compressed air or steam: metal
• Money chests, metal
• Novelties and specialties, metal: except advertising novelties
• Powder metal products, custom molding
• Reels, cable: metal
• Safe deposit boxes and chests, metal
• Safes, metal
• Shims, metal
• Spray nozzles, aerosol
• Stabilizing bars (cargo), metal
• Strapping, metal
• Tablets, metal
• Target drones for use by ships, metal
• Toilet ware, metal: except silver, nickel, silver, pewter and plated
• Trophies, metal: except silver, nickel, silver, pewter, and plated
• Vaults, except burial vaults: metal
• Wheels, stamped metal, disc type: wheelbarrow, stroller, lawnmower

The related CA Workers Comp Class Code(s) for NCCI Workers Compensation Class Code 3507 is:

The related MI Workers Comp Class Code(s) for NCCI Workers Compensation Class Code 3507 is:

The related NJ Workers Comp Class Code(s) for NCCI Workers Compensation Class Code 3507 is:

The related NY Workers Comp Class Code(s) for NCCI Workers Compensation Class Code 3507 is:

The related PA Workers Comp Class Code(s) for NCCI Workers Compensation Class Code 3507 is:

The related TA Workers Comp Class Code(s) for NCCI Workers Compensation Class Code 3507 is: