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31. Index of patents issued from Patent Office, 1950.

Corporate/Agency Authors:: Patent Office and Commerce Dept.
Publisher:: Patent Office
Date:: 1951
SuDoc number:: C 21.5/2:950

32. Index of patents issued from Patent Office, 1949.

Corporate/Agency Authors:: Patent Office and Commerce Dept.
Publisher:: Patent Office
Date:: 1950
SuDoc number:: C 21.5/2:949

33. Index of patents issued from Patent Office, 1948.

Corporate/Agency Authors:: Patent Office and Commerce Dept.
Publisher:: Patent Office
Date:: 1949
SuDoc number:: C 21.5/2:948

34. Index of patents issued from Patent Office, 1947.

Corporate/Agency Authors:: Patent Office and Commerce Dept.
Publisher:: Patent Office
Date:: 1948
SuDoc number:: C 21.5/2:947

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