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发明名称
Echo altimeter
摘要
申请公布号
US1977875(A)
申请公布日期
1934.10.23
申请号
US19300453259
申请日期
1930.05.17
申请人
ARTHUR DONALDSON CHARLES
发明人
DONALDSON CHARLES ARTHUR
分类号
G01S1/72
主分类号
G01S1/72
代理机构
代理人
主权项
地址
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