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发明名称
Automatic mailbox signal
摘要
申请公布号
US2808982(A)
申请公布日期
1957.10.08
申请号
US19540455901
申请日期
1954.09.14
申请人
ARMSTRONG WILLIAM T
发明人
ARMSTRONG WILLIAM T.
分类号
A47G29/122
主分类号
A47G29/122
代理机构
代理人
主权项
地址
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