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摘要
申请公布号
GB1250186(A)
申请公布日期
1971.10.20
申请号
GBD1250186
申请日期
1968.11.06
申请人
VEDECKOVYZKUMNY UTHELNY USTAV
发明人
KAPCA F;JALUVKA S;FIALA J
分类号
E21B21/07;E21B21/14
主分类号
E21B21/07
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