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发明名称
Film checking device for synchronized sound pictures
摘要
申请公布号
US1989971(A)
申请公布日期
1935.02.05
申请号
US19290376337
申请日期
1929.07.06
申请人
TELEFUNKEN GESELLSCHAFT FUR DRAHTLOSE TELEGRAPHIE M. B. H.
发明人
CRETIN CHARLES
分类号
G03B31/00
主分类号
G03B31/00
代理机构
代理人
主权项
地址
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