Core drill for perforating stone

Details Core drill for perforating stone Core drill for perforating stone

1992-09-29

1993-12-14

Douglas, Alan P.

Machines not elsewhere specified

Material working, abrading, or founding machinery

Element or attachment

Patent

active

D03422704

REFERENCES:
patent: 4208154 (1980-06-01), Gundy
patent: 4274769 (1981-06-01), Multakh
patent: 5069584 (1991-12-01), Obermeier et al.

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