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Patent Searching and Data


Document Type and Number:
Japanese Patent JPS6327591
Kind Code:
U
Application Number:
JP12045486U
Publication Date:
February 23, 1988
Filing Date:
August 06, 1986
Export Citation:
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International Classes:
E21B3/02; E21B15/00; (IPC1-7): E21B3/02; E21B15/00
Domestic Patent References:
JPS58164889A1983-09-29
JPS55116925A1980-09-08



 
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