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Made Under The Direction Of The United States Patent Office And The Smithsonian Institution From The Year 1854 To 1859, Inclusive / Being A Report Of The Com... »

Classified Index Of Subjects Of Invention Adopted In The U. S. Patent Office, March 1, 1872.

Classified Index Of Subjects Of Invention Adopted In The U. S. Patent Office, March 1, 1872.
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Subject-Matter Index Of Patents For Inventions Issued By The United States Patent Office From 1790 To 1873, Inclusive ...

Subject-Matter Index Of Patents For Inventions Issued By The United States Patent Office From 1790 To 1873, Inclusive ...
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