Document Type and Number:
Japanese Patent JPS567681
Kind Code:
U
Application Number:
JP8757879U
Publication Date:
January 23, 1981
Filing Date:
June 28, 1979
Export Citation:
International Classes:
B25D17/10; B25D9/26; E21B1/00; E21B44/00; (IPC1-7): B25D9/26; E21C3/32
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