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- 40012237 contributor B962759.
- 40012237 created "1940.".
- 40012237 date "1940".
- 40012237 date "1940.".
- 40012237 dateCopyrighted "1940.".
- 40012237 description "Thesis (Ph. D.)--Columbia university.".
- 40012237 extent "v, 46 p. incl. tables, diagrs.".
- 40012237 issued "1940".
- 40012237 issued "1940.".
- 40012237 language "eng".
- 40012237 publisher "New York [Menasha, Wis., George Banta publishing company]".
- 40012237 subject "537.53".
- 40012237 subject "QC544.V3 W55".
- 40012237 subject "Vacuum-tubes.".
- 40012237 title "On the theory of tubes with two control grids; their use as amplifier, modulators, and detectors, by Alexander H. Wing.".
- 40012237 type "text".