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发明名称
Combination step and extension ladder
摘要
申请公布号
US2919762(A)
申请公布日期
1960.01.05
申请号
US19570697464
申请日期
1957.11.19
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
ALFORD EDWARD L.;BENNING ARTHUR D.
分类号
E06C1/18;E06C1/32
主分类号
E06C1/18
代理机构
代理人
主权项
地址
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