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US Patent: 109,881
Improved Process for concave/vex Circular blades
Patentee: Thomas S. Disston (exact or similar names) - Philadelphia, PA USPTO Classifications: 72/324, 72/364, 76/112 Tool Categories: Assignees: Thomas S. Disston - Philadelphia, PA Henry Disston & Son - Philadelphia, PA Manufacturer: Not known to have been produced Witnesses: A. H. Shoemaker H. Howson	Patent Dates: Granted: Dec. 06, 1870 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen. "Vintage Machinery" entry for Henry Disston & Sons

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