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ID = 20444
Brand: Appareillage / Lampe MS (M.S.), Radio-Sélection; Paris
Developer: Appareillage / Lampe MS (M.S.), Radio-Sélection; Paris 
Tube type:  Triode, vacuum   Universal 
Identical to M.S.Lampe-sans-plaqu
First Source (s)
Oct.1929 : - - Manufacturers Literature

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 3.8 Volts / If 0.06 Ampere / Direct / Battery =
Description Manufacturer : Lampes MS Appareillages M.S. 9 Boulevard Rochechouart Paris
There are three versions differentiated by a colored dot:
Blue dot : high frequency use
White dot : detection
Red dot : low frequency amplification
Source : Catalogue october 1929 
Text in other languages (may differ)
Literature - - Manufacturers Literature   Catalogue MS octobre 1929
Patrice Zeissloff

M.S.Lampe-sans-plaqu: Catalogue MS octobre 1929
Patrice Zeissloff

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