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经营范围
发明名称
Electric recorder
摘要
申请公布号
US2396187(A)
申请公布日期
1946.03.05
申请号
US19390297088
申请日期
1939.09.29
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
MEANS WINTHROP J.;SLONCZEWSKI THADDEUS
分类号
G01D9/12
主分类号
G01D9/12
代理机构
代理人
主权项
地址
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