
The
Sprague-Rappaport Stethoscope features a rotating drum stem
and external spring binaural. Comes with 3 bell chest pieces
and 2 diaphrams. 22" tubing. The bell transmits low
frequency sounds, while the diaphragm transmits higher frequency
sounds. This 2-sided stethoscope was invented by Rappaport and
Sprague in the early part of the 20th century.