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发明名称
ROOF BREAKER IN THE FORM OF SHORT FRICTION-TYPE PROP
摘要
申请公布号
PL112110(B2)
申请公布日期
1980.09.30
申请号
PL19780210304
申请日期
1978.10.14
申请人
发明人
分类号
E21D;E21D15/45;(IPC1-7):E21D15/45
主分类号
E21D
代理机构
代理人
主权项
地址
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