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US Patent: 2,135,912
Internal Diameter Micrometer
Patentee: John Rae (exact or similar names) - Ellwood City, PA USPTO Classifications: 33/827 Tool Categories: metalworking tools : machinist tools : measuring tools : micrometers Assignees: National Tube Co. - McKeesport, PA Manufacturer: Not known to have been produced Witnesses: none listed	Patent Dates: Applied: Aug. 20, 1936 Granted: Nov. 08, 1938 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens
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