RECORDING HIGH-FREQUENCY COMPONENTS WITH A CONVENTIONAL DIRECT-WRITING ELECTROCARDIOGRAPH AND A FOUR-SPEED FM MAGNETIC TAPE RECORDER.
D004562:Electrocardiography; D004864:Equipment and Supplies; D006801:Humans; D060328:Magnetic Phenomena; D009068:Movement; D013637:Tape Recording; D014956:Writing
ELECTROCARDIOGRAPHY; EQUIPMENT AND SUPPLIES; TAPE RECORDING