Taschenbuch zum Röhren-Codex 1948/49
- - Manufacturers Literature undated data sheet
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Röhrencodex , Röhren-Taschenbuch 1950 23000 Röhren
MR4: Fin Stewart
Fin Stewart
Just Qvigstad
MR4: Typenkarten Audionröhren Dez. 1925
Thomas Lebeth
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