Electric signaling system
United States Patent 2122102

Inventors:
Adil, Lundell Torsten
Publication Date:
06/28/1938
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Assignee:
Adil, Lundell Torsten
Primary Class:
327/418
Other Classes:
313/2.100, 313/419, 379/35, 340/2.100, 315/364
International Classes:
H01J31/06; H04Q3/52; H04Q11/04; H01J31/00