ANSWERS: 1
-
Though its lineage is not completely clear, Miller Reese Hutchinson is often credited with inventing the carbon hearing aid in 1901, but the device amplified a low static sound. Sonotone Corporation was the first company to use transistors in its hearing aid devices in the 1950s. The invention of transistors by Bell Labs helped Sonotone create small portable hearing aids that allowed people to connect the device to their body.
Source:
The Hugh Hetherington On-Line Hearing Aid Museum: History
Thehearingaids.org: Hearing Aids from the Past
More Information:
Hearing, Speech & Deafness Center: Advances in Hearing Aid Technology
Copyright 2023, Wired Ivy, LLC