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US Patent: 469,451
Spirit Level
Patentee:
William Praddex (exact or similar names) - Lawrence, MA

USPTO Classifications:
33/381

Tool Categories:

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Roscoe G. Winslow
Henry W. Caldwell
Patent Dates:
Applied: Apr. 11, 1891
Granted: Feb. 23, 1892

Patent Pictures:
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