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US Patent: 1,422,231
Combined Level, Plumb, Square, and Measure
Patentee:
James Stanley - New York, NY

USPTO Classifications:
33/390

Tool Categories:
layout tools : levels
layout tools : squares
rules

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: May 04, 1920
Granted: Jul. 11, 1922

Patent Pictures:
USPTO pdf tiff
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Description:
This tool encloses a toroidal level tube in a perfectly square casing, allowing the level to reference any side of the case. In addition, each side is marked out in inches, and a lip is provided on one edge to allow the tool to be used as an inside or outside square.

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