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发明名称
STOETABSORBERENDE INNRETNING FOR BORESTRENG
摘要
申请公布号
NO802801(A)
申请公布日期
1981.03.25
申请号
NO19800002801
申请日期
1980.09.22
申请人
DELTA OIL TOOLS LTD.,
发明人
WALTER, BRUNO,
分类号
E21B17/07;F16D3/76;F16F1/52;(IPC1-7):E21B/
主分类号
E21B17/07
代理机构
代理人
主权项
地址
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