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381. Classification bulletin 55, July 1-Dec. 31, 1925, containing classification of subjects of invention revised by Classification Division.

Corporate/Agency Authors:: Patent Office and Commerce Department
Publisher:: Patent Office
Date:: 1926
SuDoc number:: C 21.3:55

382. Classification bulletin 56, Jan. 1-June 30, 1926, containing classification of subjects of invention revised by Classification Division.

Corporate/Agency Authors:: Patent Office and Commerce Department
Publisher:: Patent Office
Date:: 1926
SuDoc number:: C 21.3:56

383. Classification bulletin [54], Jan. 1-June 30, 1925, containing classification of subjects of invention revised by Classification Division.

Corporate/Agency Authors:: Patent Office and Commerce Department
Publisher:: Patent Office
Date:: 1925
SuDoc number:: C 21.3:54

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