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发明名称
LOGICAL SWITCHING SYSTEMS
摘要
申请公布号
US3507122(A)
申请公布日期
1970.04.21
申请号
USD3507122
申请日期
1968.09.11
申请人
BERGWERKSVERBAND GMBH.
发明人
HELMUT SCHMIDT
分类号
E21D23/12;H03K19/00;H03K19/173;(IPC1-7):E21D23/20
主分类号
E21D23/12
代理机构
代理人
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地址
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