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US Patent: 89,625
Improvement in adjustable centre-square
Patentee: William H. Brock (exact or similar names) - Bridgeport, CT USPTO Classifications: 33/428 Tool Categories: layout tools : marking gauges : center marking gauges Assignees: Charles H. Huntoon - Bridgeport, CT William H. Brock - Bridgeport, CT Manufacturer: Not known to have been produced Witnesses: A. J. Tibbits John E. Earle	Patent Dates: Granted: May 04, 1869 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin

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