U.S. patents covering time keeping mechanisms (1892)
United States. Patent Office · [Washington : United States Patent Office] · leaf 533
THE NORBi, PETERS C JTnO . wXSh:ncT...n i (No Model.) 17 Sheets—Sheet 3. G. E. HUNTER. MECHANISM FOR TESTING WATCH BALANCES AND HAIR SPRINGS. No. 490,202. . Patented Jan. 17, 1893. … (jt^A^^?LLr<<j( Ocv^iauaJI a^« CC(/L9*-viAjt^ya— HE WORBIS PETE*S CO. PHOTO-LITMO (No Model.) 17 Sheets—Sheet 4. G. E. HUNTER. MECHANISM FOR TESTING WATCH BALANCES AND HAIR SPRINGS. No. 490,202. Patented Jan. 17, 1893. <%<* O o £
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-graphophonepaten15unit-265-163.webp)
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten20unit-371-158.webp)
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten20unit-531-242.webp)
