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经营范围
发明名称
CORE BIT WITH BOTTOM CIRCULATION OF FLUSHING FLUID
摘要
申请公布号
SU924347(A1)
申请公布日期
1982.04.30
申请号
SU19803210276
申请日期
1980.12.01
申请人
VOROSHILOVGRADSKOE OTDEL SP PK T BYURO V PROIZVODSTVENNOGO OBEDINENIYA "SOYUZGEOTEKHNIKA" MINGEO SSSR
发明人
ROMANKO KONSTANTIN L,SU;KVENTSEL ANATOLIJ L,SU
分类号
E21B21/00;E21B25/00;(IPC1-7):E21B25/00
主分类号
E21B21/00
代理机构
代理人
主权项
地址
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