Document Type and Number:
Japanese Patent JPS6395794
Kind Code:
U
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Application Number:
JP18429587U
Publication Date:
June 21, 1988
Filing Date:
December 04, 1987
Export Citation:
International Classes:
E21B3/00; E04H17/22; (IPC1-7): E21B3/00; E04H17/22
Domestic Patent References:
| JPS5367901A | 1978-06-16 |