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发明名称
CIRCULATION SYSTEM
摘要
申请公布号
SU989035(A1)
申请公布日期
1983.01.15
申请号
SU19813350267
申请日期
1981.10.28
申请人
KIRSH BORIS A,SU
发明人
KIRSH BORIS A,SU
分类号
E21B21/01;E21B21/06;(IPC1-7):E21B21/06
主分类号
E21B21/01
代理机构
代理人
主权项
地址
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