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Patent drawing - Drawing of Soldiers Filtering Drinking Cup Public dom...
Utility Patent Drawings Public domain reproduction of a teapot, free to use, no copyright restrictions image - Picryl description
Patent drawing - for J. O. Lose's One Wheeled Vehicle Public domain i...
Utility Patent Drawings Public domain photograph of 19th century drawing, free to use, no copyright restrictions image - Picryl description
Patent drawing - Drawing of Combined Military Cloak and Mattress Publi...
Utility Patent Drawings Public domain photograph - United States military, propaganda free to use, no copyright restrictions image - Picryl description
Patent drawing - for T. A. Edison's Incandescing Electric Lamp Public ...
Utility Patent Drawings Public domain photograph of a patent diagram drawings, free to use, no copyright restrictions image - Picryl description