Drill bit

Details Drill bit Drill bit

1990-06-22

1992-08-25

Walsh, Donald P.

Machines not elsewhere specified

Material working, abrading, or founding machinery

Element or attachment

Patent

active

D03289052

REFERENCES:
patent: D138242 (1944-07-01), Baker
patent: D255451 (1980-06-01), Herbst et al.
patent: D278065 (1985-03-01), Sydlowski et al.
patent: 949126 (1910-02-01), Lyons
patent: 1819949 (1931-08-01), Doehring
patent: 4541757 (1985-09-01), Reynolds et al.

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