DRILLING DEVICE

A drilling device for drilling a hole in the ground and/or rock and having in its drilling head a plurality of drilling wing bits (2) arranged at equal distribution with their mutual position being adjustable such that said wing bits (2) are located within a minimum diameter dimension and, on the ot...

Ausführliche Beschreibung

Bibliographische Detailangaben

1. Verfasser:	AHONEN, JUKKA
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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