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发明名称
Speaking tube
摘要
申请公布号
US1955139(A)
申请公布日期
1934.04.17
申请号
US19330653399
申请日期
1933.01.25
申请人
MARTIN GEORGE R
发明人
MARTIN GEORGE R.
分类号
G10K11/22
主分类号
G10K11/22
代理机构
代理人
主权项
地址
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