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Subject 

1. Engineering Elements And Units  (353)
2. Thermal Insulation In General  (353)
3. General Measures For Producing And Maintaining Effectivefunctioning Of Machines Or Installations  (353)
4. Gearing  (240)
5. Transporting  (181)
6. Performing Operations  (181)
7. Clutches  (162)
8. Couplings For Transmitting Rotation  (162)
9. Brakes  (162)
10. Vehicles In General  (137)
11. Technical Subjects Covered By Former Uspc Cross-Reference Art Collections [xracs] And Digests  (101)
12. General Tagging Of Cross-Sectional Technologies Spanning Over Several Sections Of The Ipc  (101)
13. General Tagging Of New Technological Developments  (101)
14. Conjoint Control Of Vehicle Sub-Units Of Different Type Ordifferent Function  (100)
15. Control Systems Specially Adapted For Hybrid Vehicles  (100)
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