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US Patent: 199,425
Centering Square & Protractor
Patentee: Eric Ericson (exact or similar names) - Joliet, IL USPTO Classifications: 33/403 Tool Categories: metalworking tools : machinist tools : measuring tools : protractors layout tools : protractors layout tools : marking gauges : center marking gauges Assignees: None Manufacturer: Not known to have been produced Witnesses: Theodore Gurlieb l. Theodore Flodin	Patent Dates: Applied: Nov. 10, 1877 Granted: Jan. 22, 1878 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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