Railway track circuits,申请号US19350007602-传众专利搜索

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发明名称	Railway track circuits
摘要
申请公布号	US2098848(A)	申请公布日期	1937.11.09
申请号	US19350007602	申请日期	1935.02.21
申请人	THE UNION SWITCH & SIGNAL COMPANY	发明人	WITMER HAROLD G.
分类号	B61L1/18	主分类号	B61L1/18
代理机构		代理人
主权项
地址

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