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As with the discovery of the phone itself, the courage of "first phone bargain" has several claimants. One of the first to intend a ring traffic was Hungarian Tivadar Puskás in 1877 while he was practical for Thomas Edison. The first trial phone barter was supported on the ideas of Puskás, and it was build by the Bell Telephone Company in Boston in 1877. The circle's first estate-execute phone traffic open on November 12, 1877 in Friedrichsberg consummate to Berlin under the guidance of Heinrich von Stephan. George W. Coy mean and build the first mercantile US blower truck which open in New Haven, Connecticut in January, 1878. The plugboard was made from "deportment thunderbolt, tool from teapot covert and tumult score string" and could manage two contemporaneous conversations. Charles Glidden is also confidence with enact an traffic in Lowell, MA. with 50 subscribers in 1878.
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