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US Patent: 517,073
Micrometer Calipers
Patentee: John D. Sloan (exact or similar names) - St. Paul, MN USPTO Classifications: 33/831 Tool Categories: metalworking tools : machinist tools : measuring tools : micrometers Assignees: Gertrude Duvall Sloane - St. Paul, MN Manufacturer: Not known to have been produced Witnesses: C. E. Van Doren H. S. Johnson T. D. Merwin	Patent Dates: Applied: Apr. 07, 1892 Granted: Mar. 27, 1894 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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