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Displaying 1 to 1 of 1 results for 1922
New invention amplifies sound of heart beat. Portrait
Publication: Purdue Alumnus
Subject: Abbott, Prof. R. B. and Microphone Stethoscope
Date: 12/1922
v. 10 p. 14
Publication: Purdue Alumnus
Subject: Abbott, Prof. R. B. and Microphone Stethoscope
Date: 12/1922
v. 10 p. 14