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Manual of Patent Examining Procedure (MPEP)
Chapter 0900
Prior Art, Search, Classification, and Routing
United States Patent and Trademark Office
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901
Prior Art
902
Search Tools and Classification Information
903
Classification in USPC
904
How to Search
905
Cooperative Patent Classification
906
International Classification of Patents for Inventions
907
Locarno Classification Designations
908
[Reserved]
909
Routing and Docketing of Applications