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发明名称
PIT-EXPANDING BIT DEVICE
摘要
申请公布号
JPH0216286(A)
申请公布日期
1990.01.19
申请号
JP19880167249
申请日期
1988.07.05
申请人
AKIBA SANGYO KK
发明人
HOSHI EIJIRO
分类号
E21B10/32
主分类号
E21B10/32
代理机构
代理人
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