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发明名称
Ladder jack
摘要
申请公布号
US2936989(A)
申请公布日期
1960.05.17
申请号
US19580775277
申请日期
1958.11.20
申请人
CLARENCE SIEK
发明人
SIEK CLARENCE
分类号
E06C7/16
主分类号
E06C7/16
代理机构
代理人
主权项
地址
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