Drill bit

Details Drill bit Drill bit

1987-04-08

1990-04-03

Vales-Lado, Carmen H.

Machines not elsewhere specified

Agricultural or construction machinery

Drilling, mining, or soil treatment

D15139

Patent

active

D03070204

REFERENCES:
patent: 3095935 (1958-09-01), Hildebrandt et al.
patent: 4176723 (1979-12-01), Arceneaux
patent: 4350215 (1982-09-01), Radtke
patent: 4460053 (1984-07-01), Jurgens et al.
patent: 4553615 (1985-11-01), Grainger
patent: 4660659 (1987-04-01), Short, Jr. et al.
patent: 4669556 (1987-06-01), Barr et al.

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