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发明名称
Einrichtung zur Aufzeichnung von Schallschwingungen, insbesondere fuer Tonfilme
摘要
申请公布号
DE750612(C)
申请公布日期
1945.01.24
申请号
DE1934E045437D
申请日期
1934.03.29
申请人
ELECTRICAL RESEARCH PRODUCTS INC.
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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