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Marey sphygmograph, Mahomed's modification

1873-1900

Dudgeon sphygmograph by Maw

1870-1901

Dudgeon sphygmograph

Early type of Richardson sphygmograph, in case, c.1883, English

Early type of Richardson sphygmograph

circa 1883
Dudgeon sphygmograph by Mayer and Meltzer, in case, English

Dudgeon sphygmograph by Mayer and Meltzer