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1957632
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Patent Grant
1957632
References
Source
Patent Number
1,957,632
Date Filed
Not available
Date Issued
Tuesday, May 8, 1934
90 years ago
CPC
G04C23/20 - with contacts operated, or formed by clock hands or elements of similar form
US Classifications
200 - Electricity: circuit makers and breakers
023 - Chemistry: physical processes
968 - Horology
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