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Gibson's Clinical Polygraph, London, England, 1900-1910
Sphygmograph, 4 tambours and 4 pens (one broken), cur pressure, with box of accessories, Dr. A.G. Gibson's Clinical Polygraph, made by Hawksley and Sons Limited, 357 Oxford Street, London, England, 1900-1910.
Cased Marey sphymograph
Marey's sphygmograph, brass, cased, by Breguet, France, 1885-1910