United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 31
ining like earthymaterials and shellac, said layers beingunited together and constituting a tablet, thesound-record groove being impressed uponsaid surface layer. In testimony whereof we have signed thisspecification in the presence of two subscrib-ing witnesses. WILLIAM HELM HOYT.WILLIAM JOSEPH… … J^Uf.Z.
Phonograph · Patents
Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents], 1878, leaf 31](https://img.insideoutlibrary.com/img/1024/ia-graphophonepaten07unit-31-35.webp)
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten02unit-732-314.webp)
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten20unit-1131-504.webp)
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten10unit-479-331.webp)
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten02unit-554-239.webp)