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发明名称
Extension device
摘要
申请公布号
US2150872(A)
申请公布日期
1939.03.14
申请号
US19360112844
申请日期
1936.11.27
申请人
J. F. STURDY'S SONS COMPANY
发明人
NELSON NELS T.
分类号
A44C5/24
主分类号
A44C5/24
代理机构
代理人
主权项
地址
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