Gap indicating mechanism for railway switch signals,申请号US19310546461-传众专利搜索

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发明名称	Gap indicating mechanism for railway switch signals
摘要
申请公布号	US1885460(A)	申请公布日期	1932.11.01
申请号	US19310546461	申请日期	1931.06.24
申请人	MCELHANEY ROBERT S	发明人	MCELHANEY ROBERT S.
分类号	B61L9/00	主分类号	B61L9/00
代理机构		代理人
主权项
地址

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