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Creation Date 

1. Before 1959  (150,131)
2. 1959 To 1973  (90,442)
3. 1974 To 1988  (171,951)
4. 1989 To 2004  (322,980)
5. After 2004  (626,723)
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Subject 

1. Technical Subjects Covered By Former Uspc  (919,437)
2. Technical Subjects Covered By Former Us Classification  (733,184)
3. Technologies Or Applications For Mitigation Or Adaptation Againstclimate Change  (489,472)
4. Chemistry  (307,335)
5. Metallurgy  (307,335)
6. Technical Subjects Covered By Former Uspc Cross-Reference Artcollections [xracs] And Digests  (253,161)
7. Lighting  (251,696)
8. Weapons  (251,696)
9. Blasting  (251,696)
10. Heating  (251,696)
11. Mechanical Engineering  (251,696)
12. Vehicles In General  (241,126)
13. Physical Or Chemical Processes Or Apparatus In General  (231,108)
14. Machine Tools  (187,522)
15. Metal-Working Not Otherwise Provided For  (187,522)
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Language 

1. English  (1,186,796)
2. French  (215,092)
3. German  (183,007)
4. Chinese  (125,308)
5. Korean  (38,173)
6. Japanese  (29,112)
7. Spanish  (17,753)
8. Russian  (11,893)
9. Portuguese  (11,080)
10. Swedish  (7,886)
11. Italian  (5,062)
12. Dutch  (4,294)
13. Finnish  (3,073)
14. Danish  (3,034)
15. Norwegian  (1,702)
16. Polish  (1,655)
17. Czech  (476)
18. Ukrainian  (471)
19. Romanian  (418)
20. Turkish  (255)
21. More options