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519581
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Information
Patent Grant
519581
References
Source
Patent Number
519,581
Date Filed
Not available
Date Issued
Tuesday, May 8, 1894
130 years ago
CPC
G10K1/32 - Sounding members Clappers or other strikers
US Classifications
116 - Signals and indicators
D10 - Measuring, testing, or signalling instruments
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