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经营范围
发明名称
Schallaufzeichnungsapparat.
摘要
申请公布号
AT124835(B)
申请公布日期
1931.10.10
申请号
ATD124835
申请日期
1929.11.07
申请人
ELECTRICAL RESEARCH PRODUCTS INC.
发明人
分类号
G11B3/34;G11B3/36
主分类号
G11B3/34
代理机构
代理人
主权项
地址
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