High-frequency control system for traffic signals
United States Patent 2622140
US Patent References:
Signaling apparatus
- - 1658953

Reactance controlled relay
- - 1898432

Ultra sensitive relay
- - 1917243

Burglar alarm system
- - 2031951

Relay system
- - 2290771


Inventors:
Josef, Muller
Jean, Patry
Willy, Baumberger
Albert, Klein
Publication Date:
12/16/1952
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Assignee:
SIEMENS AG ALBIS
Primary Class:
340/933
Other Classes:
331/75, 331/99, 342/69, 343/811, 343/849, 340/935, 343/814, 343/815, 367/96
International Classes:
G08G1/01; G08G1/04
US Patent References:
2238041Power control system