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发明名称
Diamond bits
摘要
申请公布号
US2727729(A)
申请公布日期
1955.12.20
申请号
US19520296224
申请日期
1952.06.28
申请人
REED ROLLER BIT COMPANY
发明人
BOICE ELVIN G.
分类号
E21B10/04;E21B10/48
主分类号
E21B10/04
代理机构
代理人
主权项
地址
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