Document Type and Number:
Japanese Patent JPS57164194
Kind Code:
U
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Application Number:
JP5200481U
Publication Date:
October 16, 1982
Filing Date:
April 10, 1981
Export Citation:
International Classes:
E21B1/26; B25D9/14; E21B1/00; E21C37/02; F15B1/02; (IPC1-7): E21C37/02; E21C3/20; F15B1/02