01	Air Conditioning, Lighting, Heating, and Ventilating	Heating, air conditioning and Lighting ventilating systems; Heat pumps; Boilers; Furnaces; Radiators; Condensers; Refrigeration and cold storage systems for non-food use. For equipment used for food preservation and preparation, See 06/08, Food, Food Service and Nutrition.
02	Civil Engineering	Construction and design of bridges, tunnels and dams; Reservoir engineering; dredging; Flood control; Waterway and coastal engineering; water supply systems; Highway and traffic engineering; Urban planning and renewal; Land surveying techniques. For the design and construction of sewers and water treatment facilities, See 24/04, Water Pollution and Control. For the design and construction of buildings, See 13/13, Structural Engineering and Building Technology. For the natural distribution and circulation of water, See 08/08, Hydrology, Limnology and Potamology.
03	Construction Equipment, Materials and Supplies	Excavation and earth moving equipment; Hoisting and conveying equipment used in construction; Construction equipment; Building materials and supplies. For property studies of brick, concrete and other ceramic materials used as building materials, See 11/02, Ceramics, Refractories and Glass.
04	Containers and Packaging	Design, production, performance and testing of containers; Packaging methods; Storage tanks and accessories. For the transportation and storage of chemicals, See 07/01, Industrial Chemistry and Chemical Processing. For the storage of fuels, See 21/04, Fuels. For radioactive material containers, See 18/06, Nuclear Radiation Shielding, Protection and Safety.
05	Couplers, Fasteners and Joints	Design, performance and testing of bolts, screws, studs, rivets, hooks, couplers, and fittings; Bonded, soldered and welded joints. For electric connectors, See 09/01, Electrical and Electronic Equipment. For pipe fittings, See 13/11, Pumps, Filters, Pipes, Tubing, Fittings and Valves.
06	Surface Transportation and Equipment	Design, operation, performance and maintenance of systems to transport passengers and cargo; Civilian passenger and cargo movement and handling; Passenger vehicles; Railroads; Rolling stock; Surface and rapid transit systems; Mass transportation systems; Moving sidewalks; Marine transportation; Merchant and marine shipping. Includes vehicle components. For armored vehicles designed specifically for combat, See 19/03, Combat Vehicles. For military logistics, See 15/05, Logistics, Military Facilities and Supplies. For civil aviation operations, See 01/06, Commercial and General Aviation. For surface effect vehicles and amphibious vehicles, See 13/06/01, Surface Effect Vehicles and Amphibious Vehicles.
06/01	Surface Effect Vehicles and Amphibious Vehicles	Vehicles supported by low pressure, low and velocity air capable of traveling over one cles or more of the following: water, ice, marsh or relatively level land. Also includes amphibious vehicles and ground effect machines. For hydrofoils, See 13/10, Marine Engineering.
07	Hydraulic and Pneumatic Equipment	Design, production, performance, and testing of hydraulic and pneumatic systems; Accumulators, distribution equipment, actuators, controls, and components. For fluidic and flueric equipment, See 09/02, Fluidics and Fluerics.
08	Manufacturing and Industrial Engineering and Control of Production Systems	Industrial production engineering; Quality control; Reliability; Maintainability; Standardization; Plant design; Inspection; Fabrication, cleaning and finishing of industrial materials. For fabrication metallurgy, See 11/06/02, Fabrication Metallurgy. For the fabrication and manufacturing of laminates, composite materials, textiles, plastics, rubber, elastomers, adhesives, seals, binders, ceramics, refractories, glass, refractory fibers, coatings, colorants or finishes, see the appropriate group in Field 11. For food processing, See 06/08, Food, Food Service and Nutrition. For chemical engineering processes, See 07/01, Industrial Chemistry and Chemical Processing. For the quality assurance and reliability management of a specific product, see the group where the product is treated.
09	Machinery and Tools	Design, production, performance and testing of machinery and tools; Machines and machine elements; Gears; Bearings; Clutches; Drives; Cams; Springs; Metal working tools; Wood working tools.
10	Marine Engineering	Design, construction, maintenance, salvage, operation and performance of all types of ships, boats, and related equipment; Naval architecture; Ships and shipbuilding. Includes hydrofoil craft, SWATH ships and planing hull craft. For submarines, See 13/10/01, Submarine Engineering. For coastal and bottom structures, See 13/02, Civil Engineering, and 13/13, Structural Engineering and Building Technology. For air cushioned ships such as hovercraft, See 13/06/01, Surface Effect Vehicles and Amphibious Vehicles. For marine nuclear propulsion, See 21/06, Nuclear Propulsion.
10/01	Submarine Engineering	Design, construction, maintenance, salvage, operation and performance of submarines and submersibles and their equipment. See also 19/08, Underwater Ordnance.
11	Pumps, Filters, Pipes, Tubing, Fittings and Valves	Design, production, operation, performance and testing of pumps, filters, pipes, tubing, pipe fittings and valves. If the application of a device is apparant, see the group where the application is treated.
12	Safety Engineering	Accident prevention; Safety measures and devices; Fire prevention; Firefighting equipment and techniques; Fire detection equipment; Safety warning systems. For forest fires and forest fire prevention, See 02/06, Forestry. For aviation accident studies, ground safety and flight safety, See 01/02, Military Aircraft Operations, and 01/06, Commercial and General Aviation. For airport crash and fire facilities, See 0l/05, Terminal Flight Facilities. For environmental health and safety, See 24/07, Environmental Health and Safety. For protective equipment, See 23/04, Protective Equipment. For nuclear safety engineering procedures, See 18/06, Nuclear Radiation Shielding, Protection and Safety.
13	Structural Engineering and Building Technology	Construction of buildings and building systems, including modular and stacking construction; Architectural design; Structural analyses; Building standards; Building technology; Earthquake engineering; Roofs and roofing systems. For the Construction of bridges, tunnels and dams, See 13/02, Civil Engineering. See also 13/03, Construction Equipment, Materials and Supplies.