Classification of subjects of invention of the United States Patent office,
arranged by divisions, with classes and subclasses in each. Revised to July 1, 1908.

APA Citation

United States. Patent Office. (1908). Classification of subjects of invention of the United States Patent office: arranged by divisions, with classes and subclasses in each. Revised to July 1, 1908. Washington: Gov't Print. Off..

MLA Citation

United States. Patent Office. Classification of Subjects of Invention of the United States Patent Office: Arranged by Divisions, With Classes And Subclasses In Each. Revised to July 1, 1908. Washington: Gov't Print. Off., 1908.