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US Patent: 1,821,398
Micrometer Calipers
Patentee: Robert J. O. Simpson (exact or similar names) - Athol, Worcester County, MA USPTO Classifications: 33/501.4 Tool Categories: metalworking tools : machinist tools : measuring tools : micrometers Assignees: L. S. Starrett Co. - Athol, Worcester County, MA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Aug. 21, 1922 Granted: Sep. 01, 1931 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for L. S. Starrett Co. Wikipedia entry for the L. S. Starrett Company The Starrett Story History of the L. S. Starrett Co.

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