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3564731
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Patent Grant
3564731
References
Source
Patent Number
3,564,731
Date Filed
Not available
Date Issued
Tuesday, February 23, 1971
53 years ago
CPC
G09D1/00 - Railway or like time or fare tables Indicating or reading aids therefor
G09F7/08 - the elements being secured or adapted to be secured by means of grooves, rails, or slits
US Classifications
434 - Education and demonstration
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