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Patent Searching and Data


Document Type and Number:
Japanese Patent JPH0348317
Kind Code:
Y2
Application Number:
JP3881585U
Publication Date:
October 15, 1991
Filing Date:
March 20, 1985
Export Citation:
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International Classes:
E21B1/26; E21B1/00; (IPC1-7): E21C3/20



 
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