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US Patent: 1,797,121
Micrometer Gage for Internal Threads
Patentee: Frank J. Bohn (exact or similar names) - Washington, DC USPTO Classifications: 33/199R, 33/829 Tool Categories: metalworking tools : machinist tools : measuring tools : micrometers Assignees: None Manufacturer: Not known to have been produced Witnesses: none listed	Patent Dates: Applied: May 25, 1929 Granted: Mar. 17, 1931 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens
Description: Corace S. Beale - patent attorney

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