NASA NTRS · 19710017758
Vibrophonocardiograph Patent
Abstract
Vibrophonocardiograph comprising low weight and small volume piezoelectric microphone with amplifier having high imput impedance for high sensitivity and low frequency response
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Barker, P., Wright, L. N.. 1971-02-16. Vibrophonocardiograph Patent. https://ntrs.nasa.gov/citations/19710017758
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