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Thaddeus Cahill Telharmonium patent us. of by Thaddeus Cahill dated April applied February Source uspto gov piw docid US SectionNum IDKey CEBE HomeUrl uspto gov Sect PTO Sect HITOFF Fnetahtml FPTO Fsearchbool html co AND PALL PN OS PN RS PN US Patent Office Creator Thaddeus Cahill PDold PDUSpatent Thaddeus Cahill Telharmonium