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US Patent: 120,675
Improvement in Spirit Levels
Patentee:
George A. Shelley - Madison, CT

USPTO Classifications:
33/451

Tool Categories:
layout tools : levels
layout tools : squares

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Wm. S. Hull
J. Myron Hull

Patent Dates:
Granted: Nov. 07, 1871

Patent Pictures:
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Description:
Folding spirit level that can be set at a right angle.

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