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发明名称
Impact drill
摘要
申请公布号
US2713992(A)
申请公布日期
1955.07.26
申请号
US19520271014
申请日期
1952.02.11
申请人
SNYDER OIL TOOL CORPORATION
发明人
SNYDER ROBERT E.
分类号
E21B4/10
主分类号
E21B4/10
代理机构
代理人
主权项
地址
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