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US Patent: 1,940,475
Micrometer caliper
Patentees: Eugene J. Witchger (exact or similar names) - Saginaw, MI Oscar A. Koebke (exact or similar names) - Saginaw, MI USPTO Classifications: 33/816 Tool Categories: layout tools : measurement gauges Assignees: Lufkin Rule Company - Saginaw, MI Manufacturer: Lufkin Rule Company - Saginaw, MI Witnesses: Unknown	Patent Dates: Applied: May 20, 1932 Granted: Dec. 19, 1933 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen
Description: Lufkin Thread Micrometer found with this patent and 2,212,910

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