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2436539
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Information
Patent Grant
2436539
References
Source
Patent Number
2,436,539
Date Filed
Not available
Date Issued
Tuesday, February 24, 1948
76 years ago
CPC
G07C1/20 - Checking timed patrols
G07C1/04 - wherein the time is indicated in figures
US Classifications
346 - Recorders
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