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Patent Searching and Data


Document Type and Number:
Japanese Patent JPS5726959
Kind Code:
Y2
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Application Number:
JP15943876U
Publication Date:
June 11, 1982
Filing Date:
November 29, 1976
Export Citation:
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International Classes:
B25D9/12; E21B1/00; E21B1/26; E21B44/00; (IPC1-7): E21C3/32



 
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