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US Patent: 120,675
Improvement in Spirit Levels
Patentee: George A. Shelley (exact or similar names) - 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: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.
Description: Folding spirit level that can be set at a right angle.

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