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1. Classified index of subjects of invention adopted in the U. S. Patent office, March 1, 1872.

Notes:
321 p. 23 1/2cm.
Data Provider:
University of Michigan. Libraries
Collection:
Washington,: Govt. print. off., and Ann Arbor, Michigan: University of Michigan Library

2. Subject-matter index of patents for inventions issued by the United States Patent office from 1790 to 1873, inclusive ...

Notes:
3 v. 28 cm.
Data Provider:
University of Michigan. Libraries
Collection:
Washington,: Govt. print. off., and Ann Arbor, Michigan: University of Michigan Library

3. Subject-matter index of patents for inventions issued by the United States Patent office from 1790 to 1873, inclusive ...

Notes:
3 v. 28 cm.
Data Provider:
University of Michigan. Libraries
Collection:
Washington,: Govt. print. off., and Ann Arbor, Michigan: University of Michigan Library

4. Subject-matter index of patents for inventions issued by the United States Patent office from 1790 to 1873, inclusive ...

Notes:
3 v. 28 cm.
Data Provider:
University of Michigan. Libraries
Collection:
Washington,: Govt. print. off., and Ann Arbor, Michigan: University of Michigan Library