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US Patent: 436,526
Centering Device
Patentee: Alonzo P. Henderson (exact or similar names) - Hanover, Plymouth County, MA USPTO Classifications: 33/672 Tool Categories: layout tools : marking gauges : center marking gauges Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jun. 03, 1890 Granted: Sep. 16, 1890 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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