Thermionic apparatus
United States Patent 1907508
Inventors:
Coolidge, William D.
Publication Date:
05/09/1933
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Assignee:
GEN ELECTRIC
Primary Class:
Other Classes:
378/134, 378/115, 315/106, 315/98, 315/13.100, 313/42, 315/107
International Classes:
H05G1/52; H05G1/00