Stepped fluted drill

Details Stepped fluted drill Stepped fluted drill

1987-07-01

1989-03-28

Briggs, William R.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having stepped cutting edges

B23B 5110

Patent

active

048159026

ABSTRACT:
A drill for piloting holes, drilling holes, countersinking and counterboring holes in wood or wood-like materials comprises:

REFERENCES:
patent: 252704 (1882-01-01), Southwick
patent: 1070425 (1913-08-01), Darling, Jr.
patent: 1711012 (1929-04-01), Brandt
patent: 2276532 (1942-03-01), Welty
patent: 2529143 (1950-11-01), Eriksson
patent: 2732869 (1956-01-01), Stearns
patent: 2886081 (1959-05-01), Conley
patent: 2897695 (1959-08-01), Winslow
patent: 2943658 (1960-07-01), Labbee, Jr.

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