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M_Ediswan

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ID = 28644
       
Country:
Great Britain (UK)
Brand: Ediswan, Siemens Edison Swan Electric Co.; London
Tube type:  UNKNOWN 
Identical to M_Ediswan
First year 1927 Saga of the Vacuumtube, Tyne page 373

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament
 

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