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发明名称
SELECTIVE CHANNEL OF A RAILROAD SUPERVISORY LINE
摘要
申请公布号
PL142051(B2)
申请公布日期
1987.09.30
申请号
PL19840250004
申请日期
1984.10.11
申请人
发明人
分类号
B61L;B61L23/20;B61L29/00;(IPC1-7):B61L23/20
主分类号
B61L
代理机构
代理人
主权项
地址
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