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发明名称
Automatic aural-visual signal transmitter for aviation ground trainers
摘要
申请公布号
US2454503(A)
申请公布日期
1948.11.23
申请号
US19400327003
申请日期
1940.03.30
申请人
CRANE CARL J
发明人
CRANE CARL J.
分类号
G09B9/26
主分类号
G09B9/26
代理机构
代理人
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地址
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