Auxiliary stair tread,申请号US19380198664-传众专利搜索

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发明名称	Auxiliary stair tread
摘要
申请公布号	US2206862(A)	申请公布日期	1940.07.09
申请号	US19380198664	申请日期	1938.03.29
申请人	BOYD JAMES R	发明人	BOYD JAMES R.
分类号	A61H3/00;E04F11/16	主分类号	A61H3/00
代理机构		代理人
主权项
地址

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