Four-indication signal control system embodying polar biased code following and polarized line relays,申请号US19470739694-传众专利搜索

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发明名称	Four-indication signal control system embodying polar biased code following and polarized line relays
摘要
申请公布号	US2638536(A)	申请公布日期	1953.05.12
申请号	US19470739694	申请日期	1947.04.05
申请人	WESTINGHOUSE AIR BRAKE COMPANY	发明人	JR. THOMAS W. TIZZARD,
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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