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发明名称
REGENERATIVE PISTON EXCAVATOR
摘要
申请公布号
US3489230(A)
申请公布日期
1970.01.13
申请号
USD3489230
申请日期
1968.03.22
申请人
GENERAL KINETICS CORP.
发明人
DANIEL E. NELSON
分类号
E21B6/00;E21B7/00;(IPC1-7):E21B1/06;E21B3/08;E21B5/00
主分类号
E21B6/00
代理机构
代理人
主权项
地址
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