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US Patent: 320,537
Spirit Level
Patentee: Bozwell B. Butt (exact or similar names) - Newark, NJ USPTO Classifications: 33/381 Tool Categories: layout tools : levels : metallic levels Assignees: None Manufacturer: Not known to have been produced Witnesses: Robert Martin C. L. Smith	Patent Dates: Applied: Aug. 14, 1884 Granted: Jun. 23, 1885 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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