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经营范围
发明名称
Improvements in or relating to echo sounding apparatus
摘要
申请公布号
GB541680(A)
申请公布日期
1941.12.08
申请号
GB19390021769
申请日期
1939.07.26
申请人
HEINRICH HECHT;ARNOLD NICKELSEN;GERHARD SCHMIDT
发明人
分类号
G01S1/72
主分类号
G01S1/72
代理机构
代理人
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