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US Patent: 384,771
Micrometer Gage
Patentee: John A. MacDonald (exact or similar names) - Lowell, MA USPTO Classifications: 33/796, 33/806 Tool Categories: metalworking tools : machinist tools : measuring tools : micrometers Assignees: None Manufacturer: Not known to have been produced Witnesses: Albert M. Moore Gertude M. Day	Patent Dates: Applied: Mar. 21, 1887 Granted: Jun. 19, 1888 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens
Description: My invention relates to micrometer-gages, to and has for its object to attain greater ease of adjustment and greater accuracy of measurement.

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