Document Type and Number:
Japanese Patent JPS6343031
Kind Code:
Y2
Application Number:
JP6525284U
Publication Date:
November 10, 1988
Filing Date:
May 02, 1984
Export Citation:
International Classes:
E02F3/36; B25D17/28; E21B1/38; E21B4/14; (IPC1-7): B25D17/28
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