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US Patent: 282,966
Combined Protractor, Square, and Bevel
Patentees: James Duckworth (exact or similar names) - Springfield, MA Eli Smith (exact or similar names) - Springfield, MA USPTO Classifications: 33/473 Tool Categories: layout tools : bevels layout tools : levels layout tools : squares Assignees: None Manufacturer: Unknown Witnesses: H. A. Chapin J. D. Garfield	Patent Dates: Applied: Jun. 22, 1883 Granted: Aug. 14, 1883 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.

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