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US Patent: 683,033
Spirit Level
Patentee:
Edwin Elmer Frederick - Avalon, Allegheny County, PA

USPTO Classifications:
33/388

Tool Categories:
layout tools : levels : spirit levels

Assignees:
None

Manufacturer:
Unknown

Witnesses:
Jason C. Wilson
A. D. Wilson
F. D. Ammen
H. S. Shepard

Patent Dates:
Applied: Jul. 08, 1899
Granted: Sep. 24, 1901

Patent Pictures:
USPTO pdf tiff
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