Document Type and Number:
Japanese Patent JPH0274184
Kind Code:
U
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Application Number:
JP15217988U
Publication Date:
June 06, 1990
Filing Date:
November 23, 1988
Export Citation:
International Classes:
B25D9/04; B25D17/10; E21B1/00; E21B1/38; (IPC1-7): B25D9/04; B25D17/10; E21C3/04
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