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Title:
DRILLING APPARATUS USED IN GROUND DRILLING
Document Type and Number:
Japanese Patent JPS60164592
Kind Code:
A
Inventors:
RAINERU YURUGENSU
BORUKERU KURIYUGERU
Application Number:
JP1112085A
Publication Date:
August 27, 1985
Filing Date:
January 25, 1985
Export Citation:
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Assignee:
CHRISTENSEN INC NORTON
International Classes:
E21B4/00; E21B7/06; E21B7/10; E21B17/10; E21B17/20; (IPC1-7): E21B4/00; E21B17/10



 
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