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US Patent: 1,771,602
Grinder for Concave Saw Teeth
Patentees: Edward P. Armstrong (exact or similar names) - Portland, Multnomah County, OR Robert S. Jackson (exact or similar names) - Eugene, Lane County, OR USPTO Classifications: 451/150, 76/41, 76/44 Tool Categories: metalworking machines : grinders : sharpening machines : saw sharpening machines Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 25, 1927 Granted: Jul. 29, 1930 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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