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US Patent: 112,780
Improvement in Combined Gauges and Try Squares
Patentee: Frederic Castle (exact or similar names) - Montana, IA USPTO Classifications: 33/411, 33/646 Tool Categories: layout tools : scribes : clapboard markers layout tools : squares Assignees: Frederic Castle - Montana, IA Newbury J. Eaton - Montana, IA Manufacturer: Not known to have been produced Witnesses: E. E. Webb R. A. Webb M. Stewart Frederick Eberts	Patent Dates: Granted: Mar. 21, 1871 Antedated: Mar. 18, 1871 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This is a combination clapboard marker and try square, with an interesting cam-actuated locking mechanism and pistol grip handle.

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