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US Patent: 220,699
Improvement in pocket-knives
Patentee: Calvin L. Butler (exact or similar names) - Greenfield, MA USPTO Classifications: 30/155, 30/164 Tool Categories: household : pocket knives knives and cutters : pocket knives Assignees: None Manufacturer: Not known to have been produced Witnesses: James S. Grinnell William H. Allen	Patent Dates: Applied: Jun. 30, 1879 Granted: Oct. 21, 1879 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Butler Chuck Co.

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