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1848171
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Information
Patent Grant
1848171
References
Source
Patent Number
1,848,171
Date Filed
Not available
Date Issued
Tuesday, March 8, 1932
93 years ago
CPC
B61L29/24 - Means for warning road traffic that a gate is closed or closing, or that rail traffic is approaching
Y10S200/28 - Thermal spring snap
US Classifications
200 - Electricity: circuit makers and breakers
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