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... Manual of classification of patents ... January 1, 1940.

APA Citation

United States. Patent Office. (1940). ... Manual of classification of patents ... January 1, 1940. Washington: U. S. Govt. print. off..

MLA Citation

United States. Patent Office. ... Manual of Classification of Patents ... January 1, 1940. Washington: U. S. Govt. print. off., 1940.

Warning: These citations may not always be complete (especially for serials).