See how the history of hearing aid technology has progressed over the years – from non-electric ear trumpets to today’s digital hearing aids.
from Tinnitus Treatment http://ift.tt/232620R via tinnitus symptoms
from Tumblr http://ift.tt/1SKpGyT
Monday, April 25, 2016
Hearing aid history: From ear trumpets to digital technology
from Tumblr http://ift.tt/1SKpGyT
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