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ID = 28409
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Tube type:  TRIODE (Detail uncertain) 
Identical to B-I
First year Apr.1922 Saga of the Vacuumtube, Tyne Seite 416

Base Europe 4-Pin (A, 4A, B4, since 1914)
Description also with Telefunken 4 pin base. 

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