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[Graphophone patents] (1878)
United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 827
![An illustration from [Graphophone patents], 1878, leaf 827](https://img.insideoutlibrary.com/img/1024/ia-graphophonepaten10unit-827-557.webp)
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Internet Archive · Smithsonian Libraries · Public Domain Mark 1.0. Free to use for anything.
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