Document Type and Number:
Japanese Patent JPS6322224
Kind Code:
Y2
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Application Number:
JP7844384U
Publication Date:
June 17, 1988
Filing Date:
May 28, 1984
Export Citation:
International Classes:
E21B17/05; E21B4/14; E21B6/00; E21B6/02; E21B17/06; (IPC1-7): E21B4/14; E21B17/05