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发明名称
ELECTRIC WAVE GUIDES
摘要
申请公布号
CA540882(A)
申请公布日期
1957.05.14
申请号
CAD540882
申请日期
申请人
ELECTRIC AND MUSICAL INDUSTRIES LIMITED
发明人
JOHN COLLARD
分类号
主分类号
代理机构
代理人
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