United States. Patent Office. (1912). Definitions of revised classes and subclasses of subjects of invention in U.S. Patent Office, arranged in numerical order; supplement to Manual of classification, revised to Jan. 1, 1912. U.S. GPO.
Chicago Style (17th ed.) CitationUnited States. Patent Office. Definitions of Revised Classes and Subclasses of Subjects of Invention in U.S. Patent Office, Arranged in Numerical Order; Supplement to Manual of Classification, Revised to Jan. 1, 1912. Washington: U.S. GPO, 1912.
MLA (9th ed.) CitationUnited States. Patent Office. Definitions of Revised Classes and Subclasses of Subjects of Invention in U.S. Patent Office, Arranged in Numerical Order; Supplement to Manual of Classification, Revised to Jan. 1, 1912. U.S. GPO, 1912.
Warning: These citations may not always be 100% accurate.