Taschenbuch zum Röhren-Codex 1948/49
History of the British Radio Valve to 1940 p. 145 &184
- - Manufacturers Literature
Babani, International Radio Tube Encyclopaedia
MSG/HA: Telefunken Werkstattbuch
Wolfgang Bauer
Just Qvigstad
MSG/HA: COSSOR VALVE MANUAL 1935-6
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