Document Type and Number:
Japanese Patent JPS5428265
Kind Code:
Y2
Application Number:
JP7444775U
Publication Date:
September 11, 1979
Filing Date:
May 31, 1975
Export Citation:
International Classes:
E21D9/06; E02D1/00; E21B3/00; E21D9/08; E21D9/087; (IPC1-7): E21D9/08
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