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US Patent: 423,669
Spirit Level
Patentee: James Augustin Byrne (exact or similar names) - Denver, CO USPTO Classifications: 33/381, 33/451 Tool Categories: layout tools : levels Assignees: None Manufacturer: Not known to have been produced Witnesses: William Henry English David Sanderson Samuel Keo N. J. Collamer	Patent Dates: Applied: Dec. 21, 1889 Granted: Mar. 18, 1890 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This mason's level features metal wear surfaces, as well as an unusual cross-section to allow it to be more stable in use.

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