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US Patent: 1,157,825
Draftsman's Protractor
Patentee:
Robert N. Van Buskirk (exact or similar names) - Detroit, MI

USPTO Classifications:
33/426

Tool Categories:
layout tools : protractors

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Virginia C. Spratt
Agnes M. Hipkins

Patent Dates:
Applied: Nov. 25, 1912
Granted: Oct. 26, 1915

Patent Pictures:
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Report data errors or omissions to steward Ralph Brendler
Description:
This protractor features a built-in square reference surface, allowing it to be easily used in combination with a T-square for drawing lines at a specific angle to the vertical.

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