U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 91
\No Model. No. 477,049, J. W. & C. F. DU LANEY. ELECTRIC CLOCK SYNCHRONIZER. -i Sheets—Sheet -z. Patented June 14, 1892. ri£.2- … United States Patent Office. JAMES W. DU LANEY AND CHARLES F. DU LANEY, OF CANTON, OHIO.ELECTRIC CLOCK-SYJtOfciRONIZER. SPECIFICATION forming part of Letters Patent No. 477,049, dated June 14,1892. Application filed September 4, 1891. Serial No. 404,723. (No model.) To all whom it may concern: Be…
Clocks and watches
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten10unit-461-322.webp)
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten20unit-83-29.webp)
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten10unit-801-540.webp)
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten15unit-193-122.webp)
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten02unit-88-35.webp)
