Title:
【考案の名称】二重管掘削用チヤツク
Document Type and Number:
Japanese Patent JPS58134482
Kind Code:
U
Inventors:
Komura Kazuomi
Application Number:
JP3078682U
Publication Date:
September 09, 1983
Filing Date:
March 03, 1982
Export Citation:
International Classes:
E21B19/08; E21B19/06; (IPC1-7): E21B19/06
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