Document Type and Number:
Japanese Patent JPH0462494
Kind Code:
U
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Application Number:
JP10244490U
Publication Date:
May 28, 1992
Filing Date:
September 29, 1990
Export Citation:
International Classes:
E21B33/126; E02D3/12; F16L33/20; F16L35/00; (IPC1-7): F16L35/00; E02D3/12; E21B33/126; F16L33/20
Domestic Patent References:
| JPS3916976Y1 |
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