Glow cathode
United States Patent 2172207

Inventors:
Hans, Kolligs
Robert, Lauter
Publication Date:
09/05/1939
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Assignee:
SIEMENS AG
Primary Class:
428/554
Other Classes:
313/341, 428/668, 75/247, 313/345, 427/123, 427/78, 427/77, 428/649, 427/125, 75/246
International Classes:
H01J17/06; H01J17/04