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https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13957196
A sphygmograph: an instrument (also known as a 'pulsometer') for recording graphically the features of the pulse and…
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A sphygmograph: an instrument (also known as a 'pulsometer') for recording graphically the features of the pulse and variations in blood pressure. Wood engraving, 1850/1880.

Original public domain image from Wellcome Collection

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A sphygmograph: an instrument (also known as a 'pulsometer') for recording graphically the features of the pulse and variations in blood pressure. Wood engraving, 1850/1880.

More