Babani, International Radio Tube Encyclopaedia p. 234
-- Original-techn. papers.
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49
CV57: W.H.
Wolfgang Holtmann
Just Qvigstad
CV57: Manufacturer's Literature
Emilio Ciardiello
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