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Description
Three-element filamentary type, audio frequency amplifier for use where small amounts of power are needed. Patent dates printed on glass; latest one is 1925.
Type
image
Identifier
C8D437E6-91F7-46F7-BCBD-656756212548 2003-1-781
Subject
Radio--Receivers and reception Vacuum-tubes Valves Nineteen forties
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