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US Patent: 1,551,230
Hand-operated circular-saw sharpener and gummer
Patentee: Edward P. Armstrong (exact or similar names) - Portland, OR USPTO Classifications: 76/40, 76/79 Tool Categories: metalworking machines : grinders : sharpening machines : saw sharpening machines tool making : making sawblades : saw gummers Assignees: None Manufacturer: Armstrong Mfg. Co. (Portland) - Portland, OR Witnesses: Unknown	Patent Dates: Applied: Dec. 20, 1921 Granted: Aug. 25, 1925 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Armstrong Mfg. Co. (Portland)

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