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US Patent: 343,478
Micrometer-calipers
Patentee: Duncan McArthur (exact or similar names) - New Haven, CT USPTO Classifications: 33/822 Tool Categories: metalworking tools : machinist tools : measuring tools : micrometers Assignees: None Manufacturer: Not known to have been produced Witnesses: Fred C. Earle John E. Earle	Patent Dates: Applied: Feb. 19, 1886 Granted: Jun. 08, 1886 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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