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发明名称
Improvements in means for producing artificial echo
摘要
申请公布号
GB489179(A)
申请公布日期
1938.07.21
申请号
GB19370002179
申请日期
1937.01.25
申请人
THE GENERAL ELECTRIC COMPANY LIMITED;KENNETH ARTHUR MACFADYEN
发明人
分类号
G10K15/10
主分类号
G10K15/10
代理机构
代理人
主权项
地址
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