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发明名称
Roller bit
摘要
申请公布号
US2664322(A)
申请公布日期
1953.12.29
申请号
US19500189264
申请日期
1950.10.09
申请人
REED ROLLER BIT COMPANY
发明人
BOICE ELVIN G.
分类号
E21B10/22
主分类号
E21B10/22
代理机构
代理人
主权项
地址
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