Document Type and Number:
Japanese Patent JPH0418783
Kind Code:
Y2
Application Number:
JP15684487U
Publication Date:
April 27, 1992
Filing Date:
October 14, 1987
Export Citation:
International Classes:
B25D17/26; E21B1/00; (IPC1-7): B25D17/26; E21C3/00
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