Edison, Thomas Alva, 1847-1931 re: phonplex system of telegraphy
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Gilder Lehrman Collection #: GLC07616.01 Author/Creator: Edison, Thomas Alva, 1847-1931 Place Written: New York Type: Typed letter signed Date: 1886/08/12 Pagination: Order a Copy
Edison explains that the system will: "Enable you to duplicate your way wire circuits and to add circuits to your existing through wires."
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