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Subclass TJ
| TJ1-1570 | 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 | ||
