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US Patent: 1,385,405
Micrometer
Patentee: Alfred Tangen (exact or similar names) - Detroit, Wayne County, MI USPTO Classifications: 33/817 Tool Categories: metalworking tools : machinist tools : measuring tools : micrometers Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Sep. 08, 1920 Granted: Jul. 26, 1921 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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