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All Patents of Type: communication apparatus
Patents 1 - 6 of 6
First set of recordsLast set of records
NumberDatePatenteeTitleType
5,179XAug. 01, 1828J. Feinour, Sr., J. Feinour, Jr.Signal lampsignal lamps
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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