Inside Out Library · Explore
[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 322
![An illustration from [Graphophone patents], 1878, leaf 322](https://img.insideoutlibrary.com/img/1024/ia-graphophonepaten19unit-322-0.webp)
J. U. POIRIER. SOUND MODULATING DEVICE, APPLICATION FILED JAN. 19, 1917. Patented Aug. 21, 1917, 1,237,813, 2 SHEETS-SHEET 2. … FFg!3. ±- 1 izf.qj. INVENTOR WITNESS^ J.U.Poirier By Attorney .Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
More pictures from [Graphophone patents]
More like this
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten15unit-31-36.webp)
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten11unit-364-0.webp)
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten02unit-162-65.webp)
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten20unit-1231-545.webp)
