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经营范围
发明名称
Improvements in or relating to multiple track sound-film recording
摘要
申请公布号
GB479083(A)
申请公布日期
1938.01.31
申请号
GB19370030861
申请日期
1936.08.06
申请人
ELECTRICAL RESEARCH PRODUCTS INC.;BELL TELEPHONE LABORATORIES INCORPORATED
发明人
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
主权项
地址
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