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发明名称
COAL-CUTTING TOOL
摘要
申请公布号
US3431024(A)
申请公布日期
1969.03.04
申请号
USD3431024
申请日期
1967.03.27
申请人
HALBACH & BRAUN MAS. FAB.
发明人
ERNST BRAUN;GERT BRAUN
分类号
E21C25/20;E21C27/32;(IPC1-7):E21C25/22
主分类号
E21C25/20
代理机构
代理人
主权项
地址
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