Roof drill bit for mining

Details Roof drill bit for mining Roof drill bit for mining

1991-05-23

1993-10-12

Ansher, Bernard

Machines not elsewhere specified

Material working, abrading, or founding machinery

Element or attachment

D15 21

Patent

active

D03402487

REFERENCES:
patent: D265205 (1982-06-01), Munson
patent: D273390 (1984-04-01), Lassiter
patent: D273391 (1984-04-01), Lassiter
patent: 4285618 (1981-08-01), Shanley, Jr.
patent: 4637658 (1987-01-01), Annipajo et al.
patent: 4683965 (1987-08-01), Walton et al.
patent: 4733734 (1988-03-01), Bardin et al.
patent: 4817742 (1989-04-01), Whysong
patent: 4928777 (1990-05-01), Shirley-Fisher

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