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All Patents of Type: communication apparatus
Patents 1 - 5 of 5
First set of recordsLast set of records
NumberDatePatenteeTitleType
218,707Aug. 19, 1879M.J. Maxwell, C.H. BillingsImprovement in mechanical telephonescommunication apparatus
230,698Aug. 03, 1880R. EickemeyerSpeaking-telephonecommunication apparatus
243,214Jun. 21, 1881I.W. Colburn, H.J. ColburnAcoustic telephonecommunication apparatus
249,233Nov. 08, 1881R. EickemeyerSpeaking-telephonecommunication apparatus
2,292,387Aug. 11, 1942H.K. Markey, G. AntheilSecret communication systemcommunication apparatus
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