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51. Patents. Index of patents issued from Patent Office, 1930.

Corporate/Agency Authors:: Patent Office and Commerce Department
Publisher:: Patent Office
Date:: 1931
SuDoc number:: C 21.5/2:930

52. Patents. Index of patents issued from Patent Office, 1929.

Corporate/Agency Authors:: Patent Office and Commerce Department
Publisher:: Patent Office
Date:: 1930
SuDoc number:: C 21.5/2:929

53. Patents. Index of patents issued from Patent Office, 1928.

Corporate/Agency Authors:: Patent Office
Publisher:: Patent Office
Date:: 1929
SuDoc number:: C 21.5/2:928

54. Patents. Index of patents issued from Patent Office, 1927.

Corporate/Agency Authors:: Patent Office and Commerce Department
Publisher:: Patent Office
Date:: 1928
SuDoc number:: C 21.5/2:927

55. Patents. Index of patents issued from Patent Office, 1926.

Corporate/Agency Authors:: Patent Office and Commerce Department
Publisher:: Patent Office
Date:: 1927
SuDoc number:: C 21.5/2:926

56. Patents. Index of patents issued from Patent Office, [calendar year] 1925.

Corporate/Agency Authors:: Patent Office and Commerce Department
Publisher:: Patent Office
Date:: 1926
SuDoc number:: C 21.5/2:925

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