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Patent Searching and Data


Document Type and Number:
Japanese Patent JPH0444720
Kind Code:
Y2
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Application Number:
JP9218684U
Publication Date:
October 21, 1992
Filing Date:
June 19, 1984
Export Citation:
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International Classes:
E21D20/00; E21D20/02; (IPC1-7): E21D20/02