Title:
Optical telephone system
United States Patent 1981999

Inventors:
French, Norman R.
Publication Date:
11/27/1934
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Assignee:
AMERICAN TELEPHONE & TELEGRAPH
Primary Class:
398/141
Other Classes:
250/227.230, 178/63R, 65/393, 379/56.100, 333/141, 250/227.110, 250/226, 359/833, 398/134
International Classes:
G02B5/00; G02B6/10; G02B6/293; G02B6/34; G02B6/35; H01P3/20; H04B10/12; H01P3/00