Refine My Results

Creation Date 

1. Before 1920  (132,349)
2. 1920 To 1949  (170,688)
3. 1950 To 1952  (58,188)
4. 1953 To 1956  (24,911)
5. After 1956  (14,498)
6. More options 

Subject 

1. Technical Subjects Covered By Former Uspc  (360,303)
2. Technical Subjects Covered By Former Us Classification  (290,918)
3. Transporting  (150,128)
4. Performing Operations  (150,128)
5. Lighting  (108,134)
6. Weapons  (108,134)
7. Blasting  (108,134)
8. Heating  (108,134)
9. Mechanical Engineering  (108,134)
10. Technical Subjects Covered By Former Uspc Cross-Reference Artcollections [xracs] And Digests  (87,671)
11. Engineering Elements And Units  (58,278)
12. Thermal Insulation In General  (58,278)
13. General Measures For Producing And Maintaining Effectivefunctioning Of Machines Or Installations  (58,278)
14. Human Necessities  (48,238)
15. Technologies Or Applications For Mitigation Or Adaptation Againstclimate Change  (42,469)
16. Fixed Constructions  (40,627)
17. Machine Tools  (34,907)
18. More options 

Language 

1. English  (375,569)
2. French  (14,315)
3. German  (9,803)
4. Russian  (612)
5. Finnish  (111)
6. Spanish  (101)
7. Danish  (66)
8. Dutch  (35)
9. Italian  (28)
10. Japanese  (16)
11. Swedish  (10)
12. Icelandic  (2)
13. More options