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发明名称
Sound powered telephones and method of making same
摘要
申请公布号
US2705263(A)
申请公布日期
1955.03.29
申请号
US19510219565
申请日期
1951.04.06
申请人
JAY V. ZIMMERMAN COMPANY
发明人
SCHOENEBERG CARL
分类号
H04R13/02
主分类号
H04R13/02
代理机构
代理人
主权项
地址
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