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发明名称
Blowing device for rock drills
摘要
申请公布号
US2514852(A)
申请公布日期
1950.07.11
申请号
US19450636894
申请日期
1945.12.22
申请人
LE ROI COMPANY
发明人
FEUCHT ALBERT;SCHIRMER WALTER A.
分类号
E21B21/01
主分类号
E21B21/01
代理机构
代理人
主权项
地址
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