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发明名称
Sound-recording system
摘要
申请公布号
US1784858(A)
申请公布日期
1930.12.16
申请号
US19280253253
申请日期
1928.02.10
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
WENTE EDWARD C.
分类号
H04B1/62
主分类号
H04B1/62
代理机构
代理人
主权项
地址
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