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Creation Date 

1. Before 1920  (313)
2. 1920 To 1949  (1,040)
3. 1950 To 1952  (397)
4. 1953 To 1956  (199)
5. After 1956  (176)
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Subject 

1. Technical Subjects Covered By Former Uspc Cross-Reference Art Collections [xracs] And Digests  (2,122)
2. General Tagging Of Cross-Sectional Technologies Spanning Over Several Sections Of The Ipc  (2,122)
3. General Tagging Of New Technological Developments  (2,122)
4. Textiles  (2,107)
5. Production Of Cellulose  (2,104)
6. Paper-Making  (2,104)
7. Technical Subjects Covered By Former Uspc  (1,866)
8. Technical Subjects Covered By Former Us Classification  (1,264)
9. Paper Not Otherwise Provided For  (861)
10. Preparation Thereof Not Covered By Subclasses D21c Or D21d  (861)
11. Impregnating Or Coating Of Paper  (861)
12. Pulp Compositions  (861)
13. Treatment Of Finished Paper Not Covered By Class B31 Or Subclass D21g  (861)
14. Technical Subjects Covered By Former Uspc Cross-Reference Artcollections [xracs] And Digests  (740)
15. Apparatus Therefor  (473)
16. Regeneration Of Pulping Liquors  (467)
17. Production Of Cellulose By Removing Non-Cellulose Substancesfrom Cellulose-Containing Materials  (467)
18. Methods Of Producing Paper Thereon  (312)
19. Paper-Making Machines  (312)
20. Fibreboard  (296)
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Language 

1. English  (2,100)
2. Russian  (10)
3. Finnish  (10)
4. French  (2)
5. German  (2)
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