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发明名称
Rock drill rifle nut and method of making same
摘要
申请公布号
US2061807(A)
申请公布日期
1936.11.24
申请号
US19340713335
申请日期
1934.02.28
申请人
SULLIVAN MACHINERY COMPANY
发明人
NOBLE WARREN
分类号
E21B6/06
主分类号
E21B6/06
代理机构
代理人
主权项
地址
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