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经营范围
发明名称
Percussive drill bit
摘要
申请公布号
US2807443(A)
申请公布日期
1957.09.24
申请号
US19530389832
申请日期
1953.11.02
申请人
JOY MANUFACTURING COMPANY
发明人
WYMAN ROBERT A.
分类号
E21B10/38
主分类号
E21B10/38
代理机构
代理人
主权项
地址
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