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US Patent: 346,456
Micrometer Calipers
Patentee: Merrick M. Barnes (exact or similar names) - Boston, MA USPTO Classifications: 33/815 Tool Categories: metalworking tools : machinist tools : measuring tools : micrometers Assignees: None Manufacturer: Not known to have been produced Witnesses: J. Henry Taylor E. B. Tomlinson	Patent Dates: Applied: Aug. 21, 1885 Granted: Aug. 03, 1886 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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