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617664
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Information
Patent Grant
617664
References
Source
Patent Number
617,664
Date Filed
Not available
Date Issued
Tuesday, January 10, 1899
126 years ago
CPC
B61L1/20 - Safety arrangements for preventing or indicating malfunction of the device
Y10S200/13 - Shaft bearing and armature wear indicator switches
US Classifications
246 - Railway switches and signals
200 - Electricity: circuit makers and breakers
340 - Communications: electrical
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