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US Patent: 1,414,033
Protractor
Patentee: John R. Mahon (exact or similar names) - New York, NY USPTO Classifications: 33/471 Tool Categories: layout tools : protractors Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 16, 1919 Granted: Apr. 25, 1922 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This protractor features two triangles with complementary angles, allowing several different useful measurements to be marked with one setting.

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