 20th Century Devices |
 Jun 24 2008, 02:31 PM
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Advanced Member  Group: Members Posts: 157 Joined: 24-June 08 Member No.: 47  |
QUOTE (bloo4) what dramatic techniques and devices were used in the early 20th century? Question asked at Yahoo Answers Mechanical, rather than electrical Hearing Aids were used. Unlike the mechanical devices, the electrical hearing aids were based on telephone technology and were able to amplify sound. This post has been edited by Sunny: Jun 28 2008, 11:48 AM |
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