Tractionally operated ladder,申请号US19390294693-传众专利搜索

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发明名称	Tractionally operated ladder
摘要
申请公布号	US2237688(A)	申请公布日期	1941.04.08
申请号	US19390294693	申请日期	1939.09.13
申请人	LAWRENCE E. EICHEL;CARL A. MAYER	发明人	PHILLIPS JACOB HARVEY
分类号	E06C1/397	主分类号	E06C1/397
代理机构		代理人
主权项
地址

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