Drill bit

Details Drill bit Drill bit

1992-06-09

1994-06-14

Douglas, Alan P.

Machines not elsewhere specified

Material working, abrading, or founding machinery

Element or attachment

Patent

active

D03478483

REFERENCES:
patent: 354155 (1886-12-01), Libbey
patent: 1216628 (1917-02-01), Teasck
patent: 3180379 (1965-04-01), Stewart
patent: 3361014 (1968-01-01), McClennan
patent: 3880546 (1975-04-01), Segal
patent: 4606108 (1986-08-01), Davis
patent: 4782903 (1988-11-01), Strange
patent: 4838366 (1989-06-01), Jones
patent: 5031709 (1991-07-01), Fischer

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