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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| Item Link | Original Source |
|---|---|
| Full view | University of California |
| Full view | Harvard University |
| Full view | Princeton University |
| Full view | New York Public Library |