Drill bit

Details Drill bit Drill bit

1980-04-24

1982-06-29

Bullock, B. J.

Machines not elsewhere specified

Material working, abrading, or founding machinery

Element or attachment

D1509

Patent

active

D02652056

REFERENCES:
patent: D178899 (1956-10-01), Olsen
patent: 1663332 (1928-03-01), Bull
patent: 1860587 (1932-05-01), Metzger
patent: 2147926 (1939-02-01), Scott
patent: 2901224 (1959-08-01), Boice et al.

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