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ID = 28924
Brand: Nowak & Co.; Wien
Tube type:  TRIODE (Detail uncertain)   Universal 
Identical to II
First year 1927 Saga of the Vacuum Tube, Tyne page 463

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 2.3 Volts / If 0.2 Ampere / Direct / Battery =
Information source Bastelbriefe der Drahtlosen   1927, H.8
II: WEKA-Katalog 1927
Gerhard Heigl

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