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Start Over Author Commerce Department Sudoc Stem C 21.12

31. Patents. [Manual of classification of patents, 1940] errata and minor correction sheet, Jan. 1-June 30, 1940.

Corporate/Agency Authors:: Patent Office and Commerce Department
Publisher:: Patent Office
Date:: [1940.]
SuDoc number:: C 21.12:940/errata 940

32. Patents. [Manual of classification of patents, 1929, substitute pages containing corrections.]

Corporate/Agency Authors:: Patent Office and Commerce Department
Publisher:: Patent Office
Date:: 1939
SuDoc number:: C 21.12:929/p.63-64, rev./p.64A-64B, etc.

33. Patents. [Manual of classification of patents, 1929, substitute pages containing corrections.]

Corporate/Agency Authors:: Patent Office and Commerce Department
Publisher:: Patent Office
Date:: 1939
SuDoc number:: C 21.12:929/p.155-156, rev.-2.etc.

34. Patents. [Manual of classification of patents, 1929] [substitute pages containing corrections].

Corporate/Agency Authors:: Patent Office and Commerce Department
Publisher:: Patent Office
Date:: 1939
SuDoc number:: C 21.12:929/p.81-82/rev., etc.

35. Patents. [Manual of classification of patents, 1929] errata and minor correction sheet, Jan. 1-June 30, 1939.

Corporate/Agency Authors:: Patent Office and Commerce Department
Publisher:: Patent Office
Date:: [1939.]
SuDoc number:: C 21.12:929/errata 939

36. Patents. [Manual of classification of patents, 1929] errata and minor correction sheet, July 1-Dec. 31, 1938.

Corporate/Agency Authors:: Patent Office and Commerce Department
Publisher:: Patent Office
Date:: [1939.]
SuDoc number:: C 21.12:929/errata 938-2

37. Patents. [Manual of classification of patents, 1929, substitute pages containing corrections.]

Corporate/Agency Authors:: Patent Office and Commerce Department
Publisher:: Patent Office
Date:: 1938
SuDoc number:: C 21.12:929/p.153-156, rev., etc.

38. Patents. [Manual of classification of patents, 1929, substitute pages containing corrections.]

Corporate/Agency Authors:: Patent Office and Commerce Department
Publisher:: Patent Office
Date:: 1938
SuDoc number:: C 21.12:929/p.19-20, rev., etc.

39. Patents. [Manual of classification of patents, 1929, substitute pages containing corrections.]

Corporate/Agency Authors:: Patent Office and Commerce Department
Publisher:: Patent Office
Date:: 1938 reprint [with changes]
SuDoc number:: C 21.12:929/P 243-244/rev.rep.

40. Patents. [Manual of classification of patents, 1929, substitute pages containing corrections.]

Corporate/Agency Authors:: Patent Office and Commerce Department
Publisher:: Patent Office
Date:: 1938
SuDoc number:: C 21.12:929/p 235-236A

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