Document Type and Number:
Japanese Patent JPH0242793
Kind Code:
Y2
Application Number:
JP1917385U
Publication Date:
November 14, 1990
Filing Date:
February 15, 1985
Export Citation:
International Classes:
E21B17/05; F16L29/00; (IPC1-7): E21B17/05; F16L29/00
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