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Title: Early slack diaphragm condenser microphone, with plug (wall [Go to resource]
Description: Early slack diaphragm condenser microphone, with plug (wall type) (pat. No. 263,300 of 1924-5) License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Identifier: 1933-140 Go to resource More Like this...
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