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US Patent: 1,393,970
Geometrical Tool
Patentee: James H. Roberts (exact or similar names) - Charleston, SC USPTO Classifications: 33/426 Tool Categories: layout tools : bevels layout tools : squares layout tools : protractors Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jan. 03, 1921 Granted: Oct. 18, 1921 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This metal ruler features a built-in protractor arm, with a secondary arm which can be set at right angles to it.

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