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发明名称
NUMBER INDICATOR FOR AUTOMATIC TELEPHONES
摘要
申请公布号
CA308256(A)
申请公布日期
1931.02.03
申请号
CAD308256
申请日期
申请人
WILLIAM GREENBERG
发明人
WILLIAM GREENBERG
分类号
主分类号
代理机构
代理人
主权项
地址
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