Document Type and Number:
Japanese Patent JPH0344824
Kind Code:
Y2
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Application Number:
JP10375284U
Publication Date:
September 20, 1991
Filing Date:
July 11, 1984
Export Citation:
International Classes:
E02F3/06; E21B3/02; E21B7/00; (IPC1-7): E02F3/06
Next Patent: JPH0344825