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2503786
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Information
Patent Grant
2503786
References
Source
Patent Number
2,503,786
Date Filed
Not available
Date Issued
Tuesday, April 11, 1950
74 years ago
CPC
B61L5/1818 - using mobile coloured screen
Y10T74/20207 - Multiple controlling elements for single controlled element
US Classifications
074 - Machine element or mechanism
246 - Railway switches and signals
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