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3021391
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Information
Patent Grant
3021391
References
Source
Patent Number
3,021,391
Date Filed
Not available
Date Issued
Tuesday, February 13, 1962
62 years ago
CPC
G08B9/00 - Order telegraph apparatus, i.e. means for transmitting one of a finite number of different orders at the discretion of the user
US Classifications
379 - Telephonic communications
246 - Railway switches and signals
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