Language: eng / Topic: Patents -- United States - Institutions - Michigan Memories Search Results

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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 ...