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发明名称
DEVICE TO SLACKEN ROPE
摘要
申请公布号
SU1679029(A1)
申请公布日期
1991.09.23
申请号
SU19894745629
申请日期
1989.10.04
申请人
VOLGOGRADSKIJ ZAVOD BUROVOJ TEKHNIKI
发明人
VOLKOV IVAN V,SU
分类号
E21B19/00;B66D3/08;E21B19/08
主分类号
E21B19/00
代理机构
代理人
主权项
地址
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