Subject-matter index of patents for inventions issued by the United States Patent office from 1790 to 1873, inclusive vol. 2 H-P
United States. Patent Office; Leggett, Mortimer Dormer
Govt. print. off, 1874
Part of: Subject-matter index of patents for inventions issued by the United States Patent office from 1790 to 1873, inclusive ...
Govt. print. off, 1874
Part of: Subject-matter index of patents for inventions issued by the United States Patent office from 1790 to 1873, inclusive ...