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发明名称
Life ring
摘要
Life ring having apertured main body of foamed plastic with a secondary ring rigidly attached to it by connecting members.
申请公布号
US4059859(A)
申请公布日期
1977.11.29
申请号
US19760688737
申请日期
1976.05.21
申请人
HULL, EVAN B.
发明人
HULL, EVAN B.
分类号
B63C9/08;(IPC1-7):B63C9/08
主分类号
B63C9/08
代理机构
代理人
主权项
地址
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