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发明名称
Supporting beam
摘要
申请公布号
US2972965(A)
申请公布日期
1961.02.28
申请号
US19570653101
申请日期
1957.04.16
申请人
SJOSTROM ROBERT L
发明人
SJOSTROM ROBERT L.
分类号
B66C7/00
主分类号
B66C7/00
代理机构
代理人
主权项
地址
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