Railroad switch heater,申请号US19370169214-传众专利搜索

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发明名称	Railroad switch heater
摘要
申请公布号	US2199960(A)	申请公布日期	1940.05.07
申请号	US19370169214	申请日期	1937.10.15
申请人	PALMER WILLIAM E	发明人	PALMER WILLIAM E.
分类号	E01B7/24	主分类号	E01B7/24
代理机构		代理人
主权项
地址

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