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经营范围
发明名称
Automatic switching device for phonographs
摘要
申请公布号
US1986595(A)
申请公布日期
1935.01.01
申请号
US19330651485
申请日期
1933.01.13
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
NIEMANN ARTHUR W.
分类号
G11B31/00
主分类号
G11B31/00
代理机构
代理人
主权项
地址
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