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University of Michigan. Libraries
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Ann Arbor, Michigan: University of Michigan Library
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Washington,: Govt. print. off.,
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eng
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Patents -- United States
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1.
Classified index of subjects of invention adopted in the U. S. Patent office, March 1, 1872.
2.
Subject-matter index of patents for inventions issued by the United States Patent office from 1790 to 1873, inclusive ...
3.
Subject-matter index of patents for inventions issued by the United States Patent office from 1790 to 1873, inclusive ...
4.
Subject-matter index of patents for inventions issued by the United States Patent office from 1790 to 1873, inclusive ...