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US Patent: 17,823
Mode of cutting tenons by two circular saws oblique to the shaft
Patentee: William H. Harrison (exact or similar names) - Philadelphia, PA USPTO Classifications: 144/238, 144/90.1 Tool Categories: woodworking machines : joint making machines : tenoning machines Assignees: None Manufacturer: Not known to have been produced Witnesses: Samuel L. C. Welsh Theodore Bergner	Patent Dates: Granted: Jul. 14, 1857 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin

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