Cambridge Audio-Visual Heart Sound Recorder No. B.M. 21402 (c. 1955) On Display:Cambridge Audio-Visual Heart Sound Recorder No. B.M. 21402 Mattel Auto Race stands as

Cambridge Audio-Visual Heart Sound Recorder No. B.M. 21402 (c. 1955) On Display:Cambridge Audio-Visual Heart Sound Recorder No. B.M. 21402 Mattel Auto Race stands asCambridge Audio Visual Heart Sound Recorder No. B. M. 21402 The Cambridge Audio Visual Heart Sound Recorder (Model B. M. 21402), produced in the mid 20th century, was a sophisticated medical workstation that allowed heart doctors to simultaneously hear and "see" the heartbeat. Housed in a polished wooden cabinet, the machine featured a built in recording disk that captured deep, low frequency heart soundsmany of which were too low for the human ear to

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