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发明名称
Improvements in optophones
摘要
申请公布号
GB599982(A)
申请公布日期
1948.03.25
申请号
GB19450025037
申请日期
1945.09.27
申请人
JAMES ANDREW CASHIN
发明人
分类号
G09B21/00
主分类号
G09B21/00
代理机构
代理人
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