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发明名称
TELESCOPISCHE DOORSTROOMBARE SCHOKDEMPER VOOR OPNAME IN EEN BOORKOLOM NABIJ DE BOORBEITEL.
摘要
申请公布号
NL166307(B)
申请公布日期
1981.02.16
申请号
NL19700007506
申请日期
1970.05.25
申请人
RICHARD DEAN HAWN, JR., DALLAS, TEXAS, VER. ST. V. AM.
发明人
分类号
E21B17/07;(IPC1-7):E21B17/07
主分类号
E21B17/07
代理机构
代理人
主权项
地址
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