Author: Commerce Dept. / Catalog Issue Year Decade: 1940 - 1949 / Sudoc Stem: C 21.12 - Blacklight Search Results

Start Over Author Commerce Dept. Catalog Issue Year Decade 1940 - 1949 Sudoc Stem C 21.12

1. Manual of classification, amended to Apr. 1948.

Corporate/Agency Authors:: Patent Office and Commerce Dept.
Publisher:: Patent Office
Date:: [1948.]
SuDoc number:: C 21.12:948

2. Index to classification of patents, July 1, 1947.

Corporate/Agency Authors:: Patent Office and Commerce Dept.
Publisher:: Patent Office
Date:: [1947.]
SuDoc number:: C 21.12:947/ind.

3. Manual of classification of patents [revised to July 1947].

Corporate/Agency Authors:: Patent Office and Commerce Dept.
Publisher:: Patent Office
Date:: [1947.]
SuDoc number:: C 21.12:947