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US Patent: 824,134
Mortise or Hinge Gage
Patentee:
George D. McLeod - Chicago, IL

USPTO Classifications:
33/197, 33/419, 33/427, 33/44, 33/464, 33/783

Tool Categories:
layout tools : marking gauges : butt gauges
layout tools : marking gauges
layout tools : squares : bevel squares
layout tools : squares

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
C. H. Griesbauer
Forrest G. Smith
William Saar
R. Lehmann

Patent Dates:
Applied: Aug. 22, 1904
Granted: Jun. 26, 1906

Patent Pictures:
USPTO pdf tiff
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Description:
This is one of the most complicated and incomprehensible butt gages ever produced. It has the usual complement of marking arms, plus a built in arm to allow the width of the mortise to be marked, plus a built in try/square and bevel square.

Of particular interest on this patent is the registration mechanism used to ensure that the blade locks square when used as a try square.

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