Definitions of revised classes and subclasses of subjects of invention in the United States Patent office. Arranged in numerical order. A supplement to the Manual of classification. Rev. to January 1, 1912 (including classification bulletin no. 27)., by United States Patent Office

Title:	Definitions of revised classes and subclasses of subjects of invention in the United States Patent office. Arranged in numerical order. A supplement to the Manual of classification. Rev. to January 1, 1912 (including classification bulletin no. 27).
Author:	United States. Patent Office
Note:	Govt. print. off., 1912

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Subject:	Patents -- United States
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