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US Patent: 527,968
Square
Patentees:
Peter Grabler (exact or similar names) - Pittsburgh, PA
Joseph J. Brown (exact or similar names) - Pittsburgh, PA

USPTO Classifications:
33/426

Tool Categories:
layout tools : squares
layout tools : bevels

Assignees:
None

Manufacturer:
Grabler and Aslakson - Mansfield, OH

Witnesses:
H. C. Evert
H. E. Siebert
W. H. Pumphrey
Roy L. Whitcouch

Patent Dates:
Applied: Oct. 24, 1893
Granted: Oct. 23, 1894

Patent Pictures: [ 1 | 2 | 3 | 4 | 5 ]
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Description:
This square uses a cam-actuated locking mechanism and secondary pivoting fence to allow the tool to hold any two arbitrary angles. Sample marked, 'Union Try Square & Bevel, Pat. Oct. 23, 94. Grabler & Aslakson, Mansfield, OH.' The locking device on the sample tool and the advertisement differ from the patent drawing s but the angle graduations are there.

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