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发明名称
HEAVY-DUTY HYDRAULIC HAMMER
摘要
申请公布号
PL121271(B1)
申请公布日期
1982.04.30
申请号
PL19790218484
申请日期
1979.09.22
申请人
发明人
分类号
E21C;(IPC1-7):E21C3/20
主分类号
E21C
代理机构
代理人
主权项
地址
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