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发明名称
Sanitary telephone mouthpiece attachment
摘要
申请公布号
US2593382(A)
申请公布日期
1952.04.15
申请号
US19500169868
申请日期
1950.06.23
申请人
ZIMMERMANN CHARLES E
发明人
ZIMMERMANN CHARLES E.
分类号
H04R1/12
主分类号
H04R1/12
代理机构
代理人
主权项
地址
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