Automatic road signal,申请号US19300488922-传众专利搜索

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发明名称	Automatic road signal
摘要
申请公布号	US1979922(A)	申请公布日期	1934.11.06
申请号	US19300488922	申请日期	1930.10.15
申请人	WILLIAMS HOWARD C	发明人	WILLIAMS HOWARD C.
分类号	G08G1/02	主分类号	G08G1/02
代理机构		代理人
主权项
地址

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