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发明名称
Telephone mouthpiece
摘要
申请公布号
US1991002(A)
申请公布日期
1935.02.12
申请号
US19310518964
申请日期
1931.02.28
申请人
KELLOGG SWITCHBOARD AND SUPPLY COMPANY
发明人
STANLEY HARVEY H.
分类号
H04R1/08
主分类号
H04R1/08
代理机构
代理人
主权项
地址
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