Railroad-switch protector,申请号US19300421468-传众专利搜索

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发明名称	Railroad-switch protector
摘要
申请公布号	US1802406(A)	申请公布日期	1931.04.28
申请号	US19300421468	申请日期	1930.01.17
申请人	DALE HARRY B	发明人	DALE HARRY B.
分类号	B61L5/00	主分类号	B61L5/00
代理机构		代理人
主权项
地址

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