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2503574
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Information
Patent Grant
2503574
References
Source
Patent Number
2,503,574
Date Filed
Not available
Date Issued
Tuesday, April 11, 1950
74 years ago
CPC
G09F13/26 - Signs formed by electric discharge tubes
E01F9/547 - illuminated
US Classifications
040 - Card, picture, or sign exhibiting
340 - Communications: electrical
362 - Illumination
D10 - Measuring, testing, or signalling instruments
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