Title:
Filament
United States Patent 2225239

Inventors:
Charles, Spaeth
Publication Date:
12/17/1940
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Assignee:
Charles, Spaeth
Primary Class:
313/344
Other Classes:
148/423, 72/134, 205/228, 313/345, 205/149, 445/48, 140/71.500
International Classes:
H01K3/02; H01K3/00