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US Patent: 691,631
Spirit Level
Patentee:
Joseph H. Jackson - Pittsburg, Allegheny County, PA

USPTO Classifications:
33/369, 33/375

Tool Categories:
layout tools : levels : line levels

Assignees:
None

Manufacturer:
Joseph Woodwell Co. - Pittsburg, Allegheny County, PA

Witnesses:
John Groetzinger
M. E. Harrison
J. A. Herroy

Patent Dates:
Applied: Apr. 25, 1900
Granted: Jan. 21, 1902

Patent Pictures: [ 1 | 2 ]
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