Courtesy of Sonotone |
1957 publicity photo for the Sonotone Model “222” hearing aid. The “222” (at left) is compared in size to a hearing aid from 1945. |
Courtesy of Sonotone |
1957 publicity photo for the Sonotone Model “222” hearing aid. The “222” (at left) is compared in size to a hearing aid from 1945. |