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发明名称
Door knocker
摘要
申请公布号
US2747538(A)
申请公布日期
1956.05.29
申请号
US19520322758
申请日期
1952.11.26
申请人
THE H. B. IVES COMPANY
发明人
JR. JOHN B. MORSE,;BENSON FRITZ C.
分类号
G10K3/00
主分类号
G10K3/00
代理机构
代理人
主权项
地址
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