Document Type and Number:
Japanese Patent JPH0444705
Kind Code:
Y2
Application Number:
JP9919787U
Publication Date:
October 21, 1992
Filing Date:
June 27, 1987
Export Citation:
International Classes:
E02F3/02; E21B1/00; (IPC1-7): E21B1/00; E02F3/02
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