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发明名称
Roller bit
摘要
申请公布号
US1989261(A)
申请公布日期
1935.01.29
申请号
US19340741624
申请日期
1934.08.27
申请人
REED ROLLER BIT COMPANY
发明人
BEHNKE GUY E.
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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