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Patent Searching and Data


Document Type and Number:
Japanese Patent JPS6322007
Kind Code:
Y2
Application Number:
JP5412883U
Publication Date:
June 17, 1988
Filing Date:
April 13, 1983
Export Citation:
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International Classes:
E21B3/00; B23B45/00; B23B45/02; (IPC1-7): B23B45/02