Active metal compound for vacuum tubes
United States Patent 2173258

Inventors:
Lederer, Ernest A.
Publication Date:
09/19/1939
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Assignee:
RCA CORP
Primary Class:
252/181.400
Other Classes:
417/48, 313/345, 313/561
International Classes:
H01J1/14; H01J7/18; H01J1/13; H01J7/00