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Copy of the caveat of Elisha Gray, describing certain improvements in the art of transmitting vocal sounds telegraphically. (Filed Feb. 14, 1876) No. 48. Together with the official proceedings in relation thereto
- "Caveat of Elisha Gray"@en
- "Copy of the caveat of Elisha Gray, describing certain improvements in the art of transmitting vocal sounds telegraphically. (Filed Feb. 14, 1876) No. 48. Together with the official proceedings in relation thereto"@en