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Creation Date 

1. Before 1910  (89,186)
2. 1910 To 1929  (95,104)
3. 1930 To 1949  (105,703)
4. 1950 To 1952  (53,146)
5. After 1952  (21,367)
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Subject 

1. Technical Subjects Covered By Former Uspc Cross-Reference Art Collections [xracs] And Digests  (364,420)
2. General Tagging Of Cross-Sectional Technologies Spanning Over Several Sections Of The Ipc  (364,420)
3. General Tagging Of New Technological Developments  (364,420)
4. Technical Subjects Covered By Former Uspc  (342,517)
5. Technical Subjects Covered By Former Us Classification  (278,846)
6. Transporting  (140,157)
7. Performing Operations  (140,157)
8. Lighting  (95,938)
9. Weapons  (95,938)
10. Blasting  (95,938)
11. Heating  (95,938)
12. Mechanical Engineering  (95,938)
13. Technical Subjects Covered By Former Uspc Cross-Reference Artcollections [xracs] And Digests  (80,531)
14. Engineering Elements And Units  (55,540)
15. Thermal Insulation In General  (55,540)
16. General Measures For Producing And Maintaining Effectivefunctioning Of Machines Or Installations  (55,540)
17. Human Necessities  (46,016)
18. Fixed Constructions  (39,461)
19. Machine Tools  (32,990)
20. Metal-Working Not Otherwise Provided For  (32,990)
21. More options 

Language 

1. English  (363,514)
2. Russian  (554)
3. French  (237)
4. Finnish  (104)
5. German  (98)
6. Japanese  (8)
7. Dutch  (8)
8. Danish  (3)
9. Spanish  (3)
10. Italian  (1)
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