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经营范围
发明名称
Improvements in or relating to switching systems for use in photographic sound film recording apparatus
摘要
申请公布号
GB502520(A)
申请公布日期
1939.03.20
申请号
GB19380014947
申请日期
1938.05.19
申请人
ELECTRICAL RESEARCH PRODUCTS INC.
发明人
分类号
G03B31/00
主分类号
G03B31/00
代理机构
代理人
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地址
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