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经营范围
发明名称
Sound film recording apparatus
摘要
申请公布号
US1938694(A)
申请公布日期
1933.12.12
申请号
US19320620994
申请日期
1932.07.06
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
GOEHNER WILLIAM R.;HERRIOTT WILLIAM
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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