United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 748
cated at a se-ries of substations and adapted to be in-cluded in said circiiit, a series of slot-ma-chines or coin-controlled mechanisms at saidsubstations for puttingsaid telephones in andout of circuit, a talking-machine at a centralstation and means for transmitting its sound-vibrations to said… … ^
Phonograph · Patents
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