Allen series 22 stethoscope
Stethoscope, Allen series 22 (with resonance phase shift headframe). Late 20th Century.
Stethoscope, Allen series 22 (with resonance phase shift headframe). Late 20th Century. With original box and manual.
Stethoscope, Allen series 22 (with resonance phase shift headframe). Late 20th Century.
Original box and manual for stethoscope, Allen series 22 (with resonance phase shift headframe). Late 20th Century.