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US Patent: 459,361
Separable Square
Patentee: Daniel L. Gregory (exact or similar names) - Chicago, IL USPTO Classifications: 403/323 Tool Categories: layout tools : squares : carpenter squares Assignees: Daniel L. Gregory - Chicago, IL John E. Frizen - Chicago, IL Manufacturer: Not known to have been produced Witnesses: S. L. Williams Frank W. Rollins	Patent Dates: Applied: Feb. 26, 1891 Granted: Sep. 08, 1891 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.
Description: Dovetailed joint with specialized locking screw.

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