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1956751
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Information
Patent Grant
1956751
References
Source
Patent Number
1,956,751
Date Filed
Not available
Date Issued
Tuesday, May 1, 1934
90 years ago
CPC
B61L19/023 - purely mechanical
Y10T74/20238 - Interlocked
US Classifications
246 - Railway switches and signals
074 - Machine element or mechanism
235 - Registers
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