title: Design and first results of a new phonocardiograph.
mesh_terms: D000328:Adult; D000368:Aged; D001022:Aortic Valve Insufficiency / Q000503:physiopathology; D001161:Arteriosclerosis / Q000503:physiopathology; D001281:Atrial Fibrillation / Q000503:physiopathology; D003327:Coronary Disease / Q000503:physiopathology; D004562:Electrocardiography; D004582:Electronics, Medical; D005260:Female; D006321:Heart / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D010701:Phonocardiography / Q000295:instrumentation; D013637:Tape Recording