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发明名称
Supporting column
摘要
申请公布号
US2550674(A)
申请公布日期
1951.05.01
申请号
US19440532173
申请日期
1944.04.21
申请人
JOY MANUFACTURING COMPANY
发明人
CURTIS JOHN C.
分类号
B66F3/24;B66F3/42
主分类号
B66F3/24
代理机构
代理人
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