U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 219
&rtcL (No Model.; 4 Sheets—Sheet 2 W. F. GARDNER. CLOCK SYNCHRONIZING DEVICE AND SYSTEM. No. 480,577, Patented Aug. 9, 1Q92. … §&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.
Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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