Document Type and Number:
Japanese Patent JPS6239181
Kind Code:
Y2
Application Number:
JP795582U
Publication Date:
October 06, 1987
Filing Date:
January 23, 1982
Export Citation:
International Classes:
E21B1/02; E21B6/00; E21B6/02; E21B7/02; (IPC1-7): E21B6/00; E21B1/02
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