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On the theory of tubes with two control grids their use as amplifier, modulators, and detectors,

Thesis (Ph. D.)--Columbia University. / Vita. "The specific data here presented concerns the pentagrid heptode, whose type designation is 6L7 for the metal envelope and 6L7G for the glass envelope."--Introd. "List of numbered references": p. 44-45.
Date January 1940
CreatorsWing, Alexander Holbrook,
PublisherNew York [Menasha, Wis., George Banta Pub. Co.]
Source SetsOCLC
Detected LanguageEnglish

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