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发明名称
Roller bit
摘要
申请公布号
US1919505(A)
申请公布日期
1933.07.25
申请号
US19310580609
申请日期
1931.12.12
申请人
REED ROLLER BIT COMPANY
发明人
GIESEY RUSSELL
分类号
E21B10/10
主分类号
E21B10/10
代理机构
代理人
主权项
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