Title:
Photo-electric relay comprising a dirtfree transparent enclosure for the optical elements
United States Patent 3293504


Inventors:
Percival, Don R.
Application Number:
US31112063A
Publication Date:
12/20/1966
Filing Date:
09/24/1963
Assignee:
MACHINERY ELECTRIFICATION INC
Primary Class:
Other Classes:
250/206, 250/239, 361/173
International Classes:
H01H47/24
View Patent Images:
US Patent References:
3176196Photo-electric relay1965-03-30
2913637Photoconductive control circuit1959-11-17
2817021Curve following device1957-12-17