Combination step and extension ladder,申请号US19370120238-传众专利搜索

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发明名称	Combination step and extension ladder
摘要
申请公布号	US2133003(A)	申请公布日期	1938.10.11
申请号	US19370120238	申请日期	1937.01.12
申请人	WEBSTER WILLARD M	发明人	WEBSTER WILLARD M.
分类号	E06C1/32	主分类号	E06C1/32
代理机构		代理人
主权项
地址

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