Train-announcing apparatus,申请号US19270240443-传众专利搜索

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发明名称	Train-announcing apparatus
摘要
申请公布号	US1795748(A)	申请公布日期	1931.03.10
申请号	US19270240443	申请日期	1927.12.16
申请人	GEORGE J. ROGERS	发明人	WARD WALTER L.
分类号	B61L25/00	主分类号	B61L25/00
代理机构		代理人
主权项
地址

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