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US Patent: 423,090
Combined Square, Plumb, and Level
Frederick F. Smith - Vandalia, IL

USPTO Classifications:
33/368, 33/402

Tool Categories:
layout tools : squares
layout tools : levels : pendulum levels

Robert W. Ross - Vandalia, IL
Charles W. Higinbottom - Vandalia, IL

Not known to have been produced

Robert W. Ross
C. W. Higinbottom
Wm. Musser
R. W. Sommers

Patent Dates:
Applied: Aug. 06, 1889
Granted: Mar. 11, 1890

Patent Pictures:
USPTO pdf tiff
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This is basically a framing square with a swinging pendulum arm attached to it, allowing it to be used as a basic level or inclinometer.

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