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US Patent: 1,365,991
Combined Fixed-Angle Square and Protractor
Patentee: Alfred H. Helden (exact or similar names) - Kansas City, MO USPTO Classifications: 33/426 Tool Categories: layout tools : bevels layout tools : squares Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Feb. 28, 1919 Granted: Jan. 18, 1921 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This bevel square provides two indicator points, allowing both the angle and its converse to be read at once.

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