Library of Congress Classification:Class T -- Technology

Class T: Technology is a classification used by the Library of Congress Classification system. This page outlines the sub-classes of Class T.^[1]

Subclass T - Technology (general)

• T10.5-11.9 Communication of technical information
• T11.95-12.5 Industrial directories
  • T55-55.3 Industrial safety. Industrial accident prevention
• T55.4-60.8 Industrial engineering. Management engineering
  • T57-57.97 Applied mathematics. Quantitative methods
    • T57.6-57.97 Operations research. Systems analysis
  • T58.4 Managerial control systems
  • T58.5-58.64 Information technology
  • T58.6-58.62 Management information systems
  • T58.7-58.8 Production capacity. Manufacturing capacity
  • T59-59.2 Standardization
  • T59.5 Automation
  • T59.7-59.77 Human engineering in industry. Man-machine systems
  • T60-60.8 Work measurement. Methods engineering
• T61-173 Technical education. Technical schools
• T173.2-174.5 Technological change
• T175-178 Industrial research. Research and development
• T201-342 Patents. Trademarks
• T351-385 Mechanical drawing. Engineering graphics
• T391-995 Exhibitions. Trade shows. World's fairs

Subclass TA - Engineering (general). Civil engineering

• TA164 Bioengineering
• TA165 Engineering instruments, meters, etc. Industrial instrumentation
• TA166-167 Human engineering
• TA168 Systems engineering
• TA170-171 Environmental engineering
• TA174 Engineering design
• TA177.4-185 Engineering economy
• TA190-194 Management of engineering works
• TA197-198 Engineering meteorology
• TA213-215 Engineering machinery, tools, and implements
• TA329-348 Engineering mathematics. Engineering analysis
• TA349-359 Mechanics of engineering. Applied mechanics
• TA365-367 Acoustics in engineering. Acoustical engineering
• TA401-492 Materials of engineering and construction. Mechanics of materials
• TA495 Disasters and engineering
• TA501-625 Surveying
• TA630-695 Structural engineering (General)
• TA703-712 Engineering geology. Rock mechanics. Soil mechanics. Underground construction
• TA715-787 Earthwork. Foundations
• TA800-820 Tunneling. Tunnels
• TA1001-1280 Transportation engineering
• TA1501-1820 Applied optics. Photonics
• TA2001-2040 Plasma engineering. Applied plasma dynamics

Subclass TC - Hydraulic engineering. Ocean engineering

• TC1-978 Hydraulic engineering
  • TC160-181 Technical hydraulics
  • TC183-201 General preliminary operations. Dredging. Submarine building
  • TC203-380 Harbors and coast protective works. Coastal engineering. Lighthouses
  • TC401-506 River, lake, and water-supply engineering (General)
  • TC530-537 River protective works. Regulation. Flood control
  • TC540-558 Dams. Barrages
  • TC601-791 Canals and inland navigation. Waterways
  • TC801-978 Irrigation engineering. Reclamation of wasteland. Drainage
• TC1501-1800 Ocean engineering

Subclass TD - Environmental technology. Sanitary engineering

• TD159-168 Municipal engineering
• TD169-171.8 Environmental protection
• TD172-193.5 Environmental pollution
• TD194-195 Environmental effects of industries and plants
• TD201-500 Water supply for domestic and industrial purposes
  • TD419-428 Water pollution
  • TD429.5-480.7 Water purification. Water treatment and conditioning. Saline water conversion
  • TD481-493 Water distribution systems
• TD511-780 Sewage collection and disposal systems. Sewerage
• TD783-812.5 Municipal refuse. Solid wastes
• TD813-870 Street cleaning. Litter and its removal
• TD878-894 Special types of environment. Including soil pollution, air pollution, noise pollution
• TD895-899 Industrial and factory sanitation
  • TD896-899 Industrial and factory wastes
• TD920-934 Rural and farm sanitary engineering
• TD940-949 Low temperature sanitary engineering
• TD1020-1066 Hazardous substances and their disposal

Subclass TE - Highway engineering. Roads and pavements

• TE175-176.5 Highway design. Interchanges and intersections
• TE177-178.8 Roadside development. Landscaping
• TE200-205 Materials for roadmaking
• TE206-209.5 Location engineering
• TE210-228.3 Construction details. Including foundations, maintenance, equipment
• TE250-278.8 Pavements and paved roads
• TE279 Streets
• TE279.5-298 Pedestrian facilities
  • TE280-295 Sidewalks. Footpaths. Flagging
  • TE298 Curbs. Curbstones

Subclass TF - Railroad engineering and operation

• TF200-320 Railway construction
• TF340-499 Railway equipment and supplies
• TF501-668 Railway operation and management
• TF670-851 Local and light railways
  • TF840-851 Elevated railways and subways
• TF855-1127 Electric railways
• TF1300-1620 High speed ground transportation

Subclass TG - Bridge engineering

• TG1-470 Bridge engineering

Subclass TH - Building construction

• TH845-895 Architectural engineering. Structural engineering of buildings
• TH900-915 Construction equipment in building
• TH1000-1725 Systems of building construction. Including fireproof construction, concrete construction
• TH2025-3000 Details in building design and construction. Including walls, roofs
• TH3301-3411 Maintenance and repair
• TH4021-4977 Buildings: Construction with reference to use. Including public buildings, dwellings
• TH5011-5701 Construction by phase of the work (Building trades)
• TH6014-6081 Environmental engineering of buildings. Sanitary engineering of buildings
• TH6101-6887 Plumbing and pipefitting
• TH7005-7699 Heating and ventilation. Air conditioning
• TH7700-7975 Illumination. Lighting
• TH8001-8581 Decoration and decorative furnishings
• TH9025-9745 Protection of buildings. Including protection from dampness, fire, burglary

Subclass TJ - Mechanical engineering and machinery

• TJ163.13-163.25 Power resources
• TJ163.26-163.5 Energy conservation
• TJ170-179 Mechanics applied to machinery. Dynamics
• TJ181-210 Mechanical movements
• TJ210.2-211.47 Mechanical devices and figures. Automata. Ingenious mechanisms. Robots (General)
• TJ212-225 Control engineering systems. Automatic machinery (General)
• TJ227-240 Machine design and drawing
• TJ241-254.7 Machine construction (General)
• TJ255-265 Heat engines
• TJ266-267.5 Turbines. Turbomachines (General)
• TJ268-740 Steam engineering
  • TJ603-695 Locomotives
• TJ751-805 Miscellaneous motors and engines. Including gas, gasoline, diesel engines
• TJ807-830 Renewable energy sources
• TJ836-927 Hydraulic machinery
• TJ940-940.5 Vacuum technology
• TJ950-1030 Pneumatic machinery
• TJ1040-1119 Machinery exclusive of prime movers
• TJ1125-1345 Machine shops and machine shop practice
• TJ1350-1418 Hoisting and conveying machinery
• TJ1425-1475 Lifting and pressing machinery
• TJ1480-1496 Agricultural machinery. Farm machinery
• TJ1501-1519 Sewing machines

Subclass TK - Electrical engineering. Electronics. Nuclear engineering

• TK301-399 Electric meters
• TK452-454.4 Electric apparatus and materials. Electric circuits. Electric networks
• TK1001-1841 Production of electric energy or power. Powerplants. Central stations
• TK2000-2891 Dynamoelectric machinery and auxiliaries. Including generators, motors, transformers
• TK2896-2985 Production of electricity by direct energy conversion
• TK3001-3521 Distribution or transmission of electric power
• TK4001-4102 Applications of electric power
• TK4125-4399 Electric lighting
• TK4601-4661 Electric heating
• TK5101-6720 Telecommunication. Including telegraphy, telephone, radio, radar, television
• TK7800-8360 Electronics
  • TK7885-7895 Computer engineering. Computer hardware
  • TK8300-8360 Photoelectronic devices (General)
• TK9001-9401 Nuclear engineering. Atomic power
• TK9900-9971 Electricity for amateurs. Amateur constructors' manuals

Subclass TL - Motor vehicles. Aeronautics. Astronautics

• TL1-484 Motor vehicles. Cycles
• TL500-777 Aeronautics. Aeronautical engineering
• TL780-785.8 Rocket propulsion. Rockets
• TL787-4050 Astronautics. Space travel

Subclass TN - Mining engineering. Metallurgy

• TN263-271 Mineral deposits. Metallic ore deposits. Prospecting
• TN275-325 Practical mining operations. Safety measures
• TN331-347 Mine transportation, haulage and hoisting. Mining machinery
• TN400-580 Ore deposits and mining of particular metals
• TN600-799 Metallurgy
• TN799.5-948 Nonmetallic minerals
• TN950-997 Building and ornamental stones

Subclass TP - Chemical technology

• TP155-156 Chemical engineering
• TP200-248 Chemicals: Manufacture, use, etc.
• TP248.13-248.65 Biotechnology
• TP250-261 Industrial electrochemistry
• TP267.5-301 Explosives and pyrotechnics
• TP315-360 Fuel
• TP368-456 Food processing and manufacture
• TP480-498 Low temperature engineering. Cryogenic engineering. Refrigeration
• TP500-660 Fermentation industries. Beverages. Alcohol
• TP670-699 Oils, fats, and waxes
  • TP690-692.5 Petroleum refining. Petroleum products
• TP700-746 Illuminating industries (Nonelectric)
• TP751-762 Gas industry
• TP785-869 Clay industries. Ceramics. Glass
• TP875-888 Cement industries
• TP890-933 Textile bleaching, dyeing, printing, etc.
• TP934-945 Paints, pigments, varnishes, etc.
• TP1080-1185 Polymers and polymer manufacture

Subclass TR - Photography

• TR250-265 Cameras
• TR287-500 Photographic processing. Darkroom technique
• TR504-508 Transparencies. Diapositives
• TR510-545 Color photography
• TR550-581 Studio and laboratory
• TR590-620 Lighting
• TR624-835 Applied photography. Including artistic, commercial, medical photography, photocopying processes
• TR845-899 Cinematography. Motion pictures
• TR925-1050 Photomechanical processes

Subclass TS - Manufactures

• TS155-194 Production management. Operations management
• TS195-198.8 Packaging
• TS200-770 Metal manufactures. Metalworking
• TS780-788 Stonework
• TS800-937 Wood technology. Lumber
  • TS840-915 Wood products. Furniture
  • TS920-937 Chemical processing of wood
• TS940-1047 Leather industries. Tanning
• TS1060-1070 Furs
• TS1080-1268 Paper manufacture and trade
• TS1300-1865 Textile industries
• TS1870-1935 Rubber industry
• TS1950-1982 Animal products
• TS2120-2159 Cereals and grain. Milling industry
• TS2220-2283 Tobacco industry
• TS2284-2288 Animal feeds and feed mills. Pet food industry

Subclass TT - Handicrafts. Arts and crafts

• TT161-170.7 Manual training. School shops
• TT174-176 Articles for children
• TT180-200 Woodworking. Furniture making. Upholstering
• TT201-203 Lathework. Turning
• TT205-267 Metalworking
• TT300-382.8 Painting. Wood finishing
• TT387-410 Soft home furnishings
• TT490-695 Clothing manufacture. Dressmaking. Tailoring
• TT697-927 Home arts. Homecrafts. Including sewing, embroidery, decorative crafts
• TT950-979 Hairdressing. Beauty culture. Barbers' work
• TT980-999 Laundry work

Subclass TX - Home economics

• TX301-339 The house. Including arrangement, care, servants
• TX341-641 Nutrition. Foods and food supply
• TX642-840 Cooking
• TX851-885 Dining-room service
• TX901-946.5 Hospitality industry. Hotels, clubs, restaurants, etc. Food service
• TX950-953 Taverns, barrooms, saloons
• TX955-985 Building operation and housekeeping
• TX1100-1105 Mobile home living
• TX1110 Recreational vehicle living

References