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5Y4G, NATIONAL UNION, WHITE BOX

Zenith 5S-250, 1938, Zenith 10S669, 1942, Philco 38-4 radio, 1938, Philco 37-650, 1937, Philco 38-62, 1938

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U50, MARCONI, DOVER, DECEMBER 1952 MANUFACTURE, SCARCE

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U50, MARCONI OSRAM, BLACK BASE, HAMMERSMITH 1949 PRODUCTION,

5Y4G, HYTRON, WHITE BOX