Estimated Date: 1930
Name: Stethoscope, Stamp Bracelet
Description: 1.5” diaphragm of Bowle’s type. The top has a screw protrusion and a metal bracelet screws i to the housing to allow attachment to the arm to hold it in place. The diaphragm is the type with a 0.5” button protruding to localized sound. Identical in ref 31 in bibliography, which calls it a bracelet chest piece.
Reference 1: 50