Catalog Issue Year Decade: 1930 - 1939 / Sudoc Stem: C 21.3 - Blacklight Search Results

Start Over Catalog Issue Year Decade 1930 - 1939 Sudoc Stem C 21.3

11. Classification bulletin 64, Jan. 1-Dec. 31, 1932, containing classification of subjects of invention revised by Classification Division.

Corporate/Agency Authors:: Patent Office and Commerce Department
Publisher:: Patent Office
Date:: [1933.]
SuDoc number:: C 21.3:64

12. Classification bulletin 63, Jan. 1-Dec. 31, 1931, containing classification of subjects of invention revised by Classification Division.

Corporate/Agency Authors:: Patent Office
Publisher:: Patent Office
Date:: [1932.]
SuDoc number:: C 21.3:63

13. Classification bulletin 62, Jan. 1-Dec. 31, 1930, containing classification of subjects of invention revised by Classification Division.

Corporate/Agency Authors:: Patent Office and Commerce Department
Publisher:: Patent Office
Date:: [1931.]
SuDoc number:: C 21.3:62

14. Classification bulletin 61, Jan. 1-Dec. 31, 1929, containing classification of subjects of invention revised by Classification Division.

Corporate/Agency Authors:: Patent Office and Commerce Department
Publisher:: Patent Office
Date:: [1930.]
SuDoc number:: C 21.3:61

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