Document Type and Number:
Japanese Patent JPS61206789
Kind Code:
U
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Application Number:
JP9188985U
Publication Date:
December 27, 1986
Filing Date:
June 17, 1985
Export Citation:
International Classes:
E21B10/36; E21B6/00; E21B6/08; (IPC1-7): E21B10/36; E21B6/00