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发明名称
COLLAPSIBLE LADDERS
摘要
申请公布号
US3439776(A)
申请公布日期
1969.04.22
申请号
USD3439776
申请日期
1968.04.12
申请人
ERNEST O. SCHEERER
发明人
ERNEST O. SCHEERER
分类号
E06C1/383;(IPC1-7):E06C1/38
主分类号
E06C1/383
代理机构
代理人
主权项
地址
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