Category:Microphones in 1931
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Media in category "Microphones in 1931"
The following 8 files are in this category, out of 8 total.
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Bundesarchiv Bild 102-12419, John Pershing.jpg 579 × 800; 62 KB
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ElgaKernWilno.jpg 1,315 × 858; 218 KB
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Flying spot scanner 1931.jpg 608 × 798; 95 KB
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NH 42167 (23418927173).jpg 5,320 × 4,184; 1.33 MB
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Roy E Steckel c1931.jpg 159 × 199; 4 KB
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Sir Henry Solomon Wellcome speaking at the cornerstone cerem Wellcome V0027851.jpg 3,129 × 2,240; 1.79 MB
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The Bell System technical journal (1922) (14776658583).jpg 1,700 × 1,304; 779 KB