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发明名称
Bohrlochpreventer
摘要
申请公布号
DE1218975(B)
申请公布日期
1966.06.16
申请号
DE1964S088958
申请日期
1964.01.04
申请人
SHAFFER TOOL WORKS
发明人
WALKER RAYMOND WILLIS;BEACH HUNTINGTON
分类号
E21B33/06;E21B33/064
主分类号
E21B33/06
代理机构
代理人
主权项
地址
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