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US Patent: 230,421
Calipers & Centering Device
Patentee: Manuel W. Kahle (exact or similar names) - Duke Centre, PA USPTO Classifications: 33/674, 33/675 Tool Categories: layout tools : calipers layout tools : marking gauges : center marking gauges Assignees: Martha Jane Kahle - Duke Centre, PA Manufacturer: Not known to have been produced Witnesses: Michael J. Stark George H. Thompson	Patent Dates: Applied: Jun. 03, 1880 Granted: Jul. 27, 1880 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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