Document Type and Number:
Japanese Patent JPS6371284
Kind Code:
U
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Application Number:
JP16186986U
Publication Date:
May 13, 1988
Filing Date:
October 22, 1986
Export Citation:
International Classes:
G01R19/165; E21B3/00; G08B21/00; (IPC1-7): E21B3/00; G01R19/165; G08B21/00