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Patent Searching and Data


Document Type and Number:
Japanese Patent JPS57193780
Kind Code:
U
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Application Number:
JP2492282U
Publication Date:
December 08, 1982
Filing Date:
February 25, 1982
Export Citation:
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International Classes:
E21B3/00; E21B7/00; (IPC1-7): E21B3/00



 
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