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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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