I came across this site. Its actually really interesting.
"Welcome to the largest on-line hearing aid museum in the world, and indeed,
probably the second largest collection of old hearing aids in the world!
When this web site is completed, you will be able to browse through more than
1,494 different hearing aids and related items that have been used down
through the years. At present there are about 825 items on-line. Many
hundreds more will be added in the future as time permits.
These hearing aids are from the private collections of Hugh Hetherington
and Neil Bauman, two of the foremost authorities on old hearing aids alive
today. Neil is also the owner/curator of “The Hearing Aid Museum”."
A question for everyone.
Which of you owns the oldest hearing aids still in active duty?