U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 221
§&i, ru^> Qttot-HCuS (No Model.) 4 Sheets—Sheet 3. W. F. GARDNER. CLOCK SYNCHRONIZING DEVICE AND SYSTEM. No. 480,577, Patented Aug. 9, 1892. … S (No Model.; 4 Sheets—Sheet 4. W. F. GARDNER. CLOCK SYNCHRONIZING DEVICE AND SYSTEM. No. 480,577 Patented Aug. 9, 1892. H3
Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
