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经营范围
发明名称
Improved pneumatic percussive drill
摘要
申请公布号
GB593076(A)
申请公布日期
1947.10.08
申请号
GB19440016111
申请日期
1944.08.24
申请人
FRANK DONNELLY
发明人
分类号
E21B1/30;E21B1/38
主分类号
E21B1/30
代理机构
代理人
主权项
地址
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