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经营范围
发明名称
Derrick
摘要
申请公布号
US2373743(A)
申请公布日期
1945.04.17
申请号
US19440535696
申请日期
1944.05.15
申请人
发明人
CLIFFORD FRED T.
分类号
B66C23/20
主分类号
B66C23/20
代理机构
代理人
主权项
地址
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