Document Type and Number:
United States Patent 2734130

Publication Date:
02/07/1956
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Primary Class:
246/130
International Classes:
B61L29/28; B61L29/00
US Patent References:
1896120Apparatus for the control of highway crossing signals
2025265Railway traffic controlling apparatus
2209225Control system
2406955Apparatus for the control of highway crossing signals
2439013Apparatus for the control of highway crossing signals
2618741Time element relay control means


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