Electronics Engineer William Birnbaum demonstrates a Phonocardiogram System (including at Type 531 Oscilloscope), manufactured by Beckman Instruments. This instrument was used on at least one of the Project Gemini manned spaceflights in 1965-1966 to monitor the heartbeat of an astronauts while they were inside the space shuttle.
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Dietrich, T. A. “William Birnbaum with a Phonocardiogram System,” circa 1965. Beckman Historical Collection, Box 55, Folder 133. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/hq37vn641.
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