Method of making electron-emitting cathodes
United States Patent 2172326

Inventors:
Wittich, Edward H.
Publication Date:
09/05/1939
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Assignee:
HYGRADE SYLVANIA CORP
Primary Class:
427/77
Other Classes:
118/52, 427/240, 427/428.110, 313/346R, 118/232, 118/244, 427/428.060
International Classes:
H01J9/06; H01J9/04