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US Patent: 359,580
Spirit Level
Patentee: Walter C. Thatcher (exact or similar names) - Baltimore, MD USPTO Classifications: 33/388 Tool Categories: layout tools : levels : spirit levels Assignees: Walter C. Thatcher - Baltimore, MD J. Albert Thatcher - Baltimore, MD Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Dec. 21, 1885 Granted: Mar. 15, 1887 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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