Cambridge Audio-Visual Heart Sound Recorder No. B.M. 21402 (c. 1955) On Display:Cambridge Audio-Visual Heart Sound Recorder No. B.M. 21402 known as a "lineman

Cambridge Audio-Visual Heart Sound Recorder No. B.M. 21402 (c. 1955) On Display:Cambridge Audio-Visual Heart Sound Recorder No. B.M. 21402 known as a "linemanCambridge 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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