Document Type and Number:
Japanese Patent JPS6338517
Kind Code:
B2
Inventors:
HOSHI FUMIO
Application Number:
JP7214283A
Publication Date:
August 01, 1988
Filing Date:
April 26, 1983
Export Citation:
Assignee:
HOSHI FUMIO
International Classes:
E21B7/02; E21B3/00; E21B7/00
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