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United States Patent 2217448

Inventors:
Erwin, Muller
Publication Date:
10/08/1940
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Assignee:
SIEMENS AG
Primary Class:
219/121.360
Other Classes:
313/351, 313/346R, 68/5D, 219/121.520, 313/336, 445/51
International Classes:
H01J9/02; H01J17/06; H01J17/04