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US Patent: 694,774
Center Square
Patentee: Karl O. Muehlberg (exact or similar names) - Braddock, PA USPTO Classifications: 33/428, 33/44 Tool Categories: layout tools : marking gauges : center marking gauges Assignees: None Manufacturer: Not known to have been produced Witnesses: Fred D. Sweet Walter Famariss James I. Kay	Patent Dates: Applied: Jul. 05, 1901 Granted: Mar. 04, 1902 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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