File:Vintage Sonotone Model 1010 Hybrid (2 Vacuum Tubes & 1 Transistor) Hearing Aid. The First Commercial Product In The World To Use Transistors, Made In USA, Introduced December 29, 1952 (26251999474).jpg

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current02:06, 29 May 2018Thumbnail for version as of 02:06, 29 May 20182,492 × 2,146 (2.41 MB)Ser Amantio di NicolaoTransferred from Flickr via #flickr2commons

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