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US Patent: 609,895
Combination Tool
Combined Drill Gage and Protractor
Patentee:
C. A. Mitchell - Indianapolis, IN

USPTO Classifications:
33/201, 33/426

Tool Categories:
layout tools : protractors
layout tools : measurement gauges

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
C. S. Frye
L. Nathan

Patent Dates:
Applied: Jan. 17, 1898
Granted: Aug. 30, 1898

Patent Pictures:
USPTO pdf tiff
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Description:
This is a machinists' combination tool that provides a protractor or bevel gage with a center finder. The patent claims many features, but the drawing shows it being used to check the angles on a drill bit (which is what it is really designed for)

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