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).

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110	1	0	‡aUnited States. ‡bPatent Office.
245	1	0	‡aDefinitions of revised classes and subclasses of subjects of invention in the United States Patent office. ‡bArranged in numerical order. A supplement to the Manual of classification. Rev. to January 1, 1912 (including classification bulletin no. 27).
260	0	⊔	‡aWashington, ‡bGovt. print. off., ‡c1912.
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