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USA Thaddeus Cahill Telharmonium patent p.. Telharmonium patent us page second drawing page 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