Pachon sphygmomanometer by G. Boulitte, 15-21 rue Bobillot, Paris, France. Pachon sphygmomanometer by G. Boulitte
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
Dudgeon sphygmograph by Krohne and Sesemann, in case, English Dudgeon sphygmograph by Krohne and Sesemann 1870-1900