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US Patent: 407,721
Machine for back-clearing twist-drills
Patentee:
Jacob D. Cox, Jr. (exact or similar names) - Cleveland, OH

USPTO Classifications:
451/134, 451/150, 451/200, 451/222

Tool Categories:
woodworking machines : specialty woodworking machines : tool making machines

Assignees:
Cox & Prentiss - Cleveland, OH

Manufacturer:
Not known to have been produced

Witnesses:
H. F. Fisher
William M. Monroe

Patent Dates:
Applied: Jan. 24, 1887
Granted: Jul. 23, 1889

Patent Pictures:
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