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US Patent: 164,999
Improvement in Bits for Boring Wood
Twist Drill for Wood
Patentee:
Gardner L. Holt - Springfield, MA

USPTO Classifications:
279/99, 408/223, 408/230, 408/233

Tool Categories:
woodworking tools : hand drills : drill bits : twist drill bits

Assignees:
None

Manufacturer:
M. W. Robinson Company - Brooklyn, NY

Witnesses:
T. C. Curtis
C. E. Buckland

Patent Dates:
Applied: Jul. 30, 1874
Granted: Jun. 29, 1875

Patent Pictures:
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Description:
Holt cites a combination of a "reamer point," sharp edged spiral grooves and slightly enlarged diameter threaded portion of the shaft where it enters the head as the basis for this patent.

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