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ID = 28657
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Developer: Mullard Radio Valve Co. Ltd.;  
Tube type:  Triode, vacuum 
Identical to K_Mul
First year Jul.1920 ? - - Manufacturers Literature

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 4 Volts / Direct / Battery =
Description Va=25-35V. Price 1.75 GBP. Mullard Advertisement in Wireless World July 10 1920. 
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Siegfried Neumann


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