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US Patent: 407,285
Combined Square, Level, Protractor, &c.
Christian Ensminger - Albany, NY

USPTO Classifications:
33/376, 33/426

Tool Categories:
combination tools
layout tools : bevels
layout tools : levels
layout tools : protractors
layout tools : squares : center squares

Cortland S. Babcock - Albany, NY

Not known to have been produced

Alex. Selkirk
Charles Selkirk
H. C. Kelly

Patent Dates:
Applied: Dec. 16, 1887
Granted: Jul. 16, 1889

Patent Pictures: [ 1 | 2 ]
USPTO pdf tiff
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This combination tool features a simple square of wood, with a groove running down the inside of the legs. Into these grooves can be fit a bevel gage/protractor (with build-in level), or a center finding tool.

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