EXCAVATING TOOL

PROBLEM TO BE SOLVED: To form a drilled hole without loosening a stratum or making a void, by suppressing the diffusion of air into the surrounding stratum, even when cuttings are discharged by discharging the compressed air to the leading end side of a tool body in the excavation of highly-permeabl...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	NAKAMURA KAZUYOSHI, HISADA KIMIYA
Format:	Patent
Sprache:	eng
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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