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Patent Searching and Data


Document Type and Number:
Japanese Patent JPS6171689
Kind Code:
U
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Application Number:
JP15618584U
Publication Date:
May 15, 1986
Filing Date:
October 16, 1984
Export Citation:
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International Classes:
E21B25/16; (IPC1-7): E21B25/16
Domestic Patent References:
JPS58168791A1983-10-05



 
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