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- 29012180 contributor B733113.
- 29012180 created "1926.".
- 29012180 date "1926".
- 29012180 date "1926.".
- 29012180 dateCopyrighted "1926.".
- 29012180 description "Thesis (Ph. D.)--Columbia university, 1928.".
- 29012180 extent "30 p.".
- 29012180 issued "1926".
- 29012180 issued "1926.".
- 29012180 language "eng".
- 29012180 publisher "New York, N.Y.,".
- 29012180 subject "TK5865 .L55 1928".
- 29012180 subject "Vacuum-tubes.".
- 29012180 title "Operation of thermionic vacuum tube circuits, by Frederick Britton Llewellyn ...".
- 29012180 type "text".