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Amos R Dolbear
Dolbear's New Telephonic System, Front Page Wood engraving
Front page wood engraving of the June 18, 1881 Scientific American weekly journal.
Title: Professor A. E. Dolbear's New Telephonic System
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Dolbear's New Telephone System
A NEW TELEPHONE SYSTEM. Scientific American New York June 18, 1881
Dolbear's New Telephonic System, Front Page Wood engraving