Heavy duty roof drill bit

Details Heavy duty roof drill bit Heavy duty roof drill bit

2006-10-10

2006-10-10

Davis, Antoine D. (Department: 2915)

Machines not elsewhere specified

Material working, abrading, or founding machinery

Element or attachment

Design Patent

active

D0529937

CLAIM:
The ornamental design for a heavy duty roof drill bit, as shown and described.

REFERENCES:
patent: 3163246 (1964-12-01), Vagins et al.
patent: 5180022 (1993-01-01), Brady
patent: D340248 (1993-10-01), Brady
patent: D351174 (1994-10-01), Brady
patent: 5429199 (1995-07-01), Sheirer et al.
patent: 6044920 (2000-04-01), Massa et al.
patent: D424579 (2000-05-01), Brady
patent: D430578 (2000-09-01), Brady
patent: D514131 (2006-01-01), Brady

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