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US Patent: 230,715
Grinding Twist Drills
Patentee:
Isaac L. Penney (exact or similar names) - Minneapolis, Hennepin County, MN

USPTO Classifications:
451/220, 451/340, 451/375

Tool Categories:
metalworking machines : grinders : tool grinders

Assignees:
Isaac L. Penney - Minneapolis, Hennepin County, MN
Edward George Brooks - Minneapolis, Hennepin County, MN

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Apr. 26, 1880
Granted: Aug. 03, 1880

Patent Pictures:
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