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US Patent: 423,090
Combined Square, Plumb, and Level
Patentee: Frederick F. Smith (exact or similar names) - Vandalia, IL USPTO Classifications: 33/368, 33/402 Tool Categories: layout tools : squares layout tools : levels : pendulum levels Assignees: Robert W. Ross - Vandalia, IL Charles W. Higinbottom - Vandalia, IL Manufacturer: Not known to have been produced Witnesses: Robert W. Ross C. W. Higinbottom Wm. Musser R. W. Sommers	Patent Dates: Applied: Aug. 06, 1889 Granted: Mar. 11, 1890 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: 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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