Drilling head

Details Drilling head Drilling head

1990-10-22

1993-03-16

Douglas, Alan P.

Machines not elsewhere specified

Material working, abrading, or founding machinery

Element or attachment

Patent

active

D03340163

REFERENCES:
patent: 418903 (1890-01-01), Weiss
patent: 4558975 (1985-12-01), Hale
patent: 4950108 (1990-08-01), Roos

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