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发明名称
SIGNALS AT HIGHWAY CROSSINGS FOR HIGH SPEED TRAINS
摘要
申请公布号
US3558874(A)
申请公布日期
1971.01.26
申请号
USD3558874
申请日期
1968.10.18
申请人
GENERAL SIGNAL CORP.
发明人
JOHN E. FREEHAFER
分类号
B61L29/32;(IPC1-7):B61L1/02
主分类号
B61L29/32
代理机构
代理人
主权项
地址
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