Small outside grid wireless valve marked "6921"

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Small outside grid wireless valve marked 6921'
Science Museum Group
© The Board of Trustees of the Science Museum

Small outside grid wireless valve marked "6921", (German manufacture) 1930

Details

Category:: Electronic Components

Object Number:: 1934-471

type:: valve

credit:: Lissauer, H.W.

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Small outside grid wireless valve marked "6921"

Details

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