Stethoscope: Duophon/Planoscop
- Made:
- late 20th century in Germany
Stethoscope: Duophon/Planoscop, with innovative diapragm chestpiece, made by Speidel & Keller, A Welch Allen Company, Germany. (Number 130 in R.Wilkie's catalogue).
Stethoscope: Duophon/Planoscop, with innovative diapragm chestpiece, made by Speidel & Keller, A Welch Allen Company, Germany. (Number 130 in R.Wilkie's catalogue).