Babani, International Radio Tube Encyclopaedia p. 278 & 279
- - Manufacturers Literature
Taschenbuch zum Röhren-Codex 1948/49
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
GU21: Manufacturer's Literature
Emilio Ciardiello
Just Qvigstad
GU21: GEC's catalogue supplement
Anonyme 413 Collectionneur
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