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2975272
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Patent Grant
2975272
References
Source
Patent Number
2,975,272
Date Filed
Not available
Date Issued
Tuesday, March 14, 1961
63 years ago
CPC
B61L1/187 - Use of alternating current
B61L23/10 - manually operated
US Classifications
246 - Railway switches and signals
340 - Communications: electrical
361 - Electricity: electrical systems and devices
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