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US Patent: 372,921
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Patentee: Charles Benjamin Long (exact or similar names) - Worcester, MA USPTO Classifications: 33/385 Tool Categories: layout tools : levels : machinist levels Assignees: None Manufacturer: Not known to have been produced Witnesses: Charles Moen Rice Robert Aden Knight	Patent Dates: Applied: May 11, 1886 Granted: Nov. 08, 1887 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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