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发明名称
INNRETNING FOR NEDGRAVING AV EN R¦RLEDNING UNDER VANN.
摘要
申请公布号
NO136306(C)
申请公布日期
1977.08.17
申请号
NO19720004250
申请日期
1972.11.21
申请人
BROWN & ROOT, INC.,
发明人
PEROT, JOSEPH CHARLES, JR.,
分类号
E02F5/10;E02F9/06;F16L3/00;(IPC1-7):E02F3/88
主分类号
E02F5/10
代理机构
代理人
主权项
地址
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