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发明名称
Selective system
摘要
申请公布号
US1901867(A)
申请公布日期
1933.03.21
申请号
US19290335041
申请日期
1929.01.25
申请人
HENRY BURTON
发明人
BURTON HENRY
分类号
H04Q5/16
主分类号
H04Q5/16
代理机构
代理人
主权项
地址
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