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发明名称
Measurement of echoes
摘要
申请公布号
US1748192(A)
申请公布日期
1930.02.25
申请号
US19280316016
申请日期
1928.10.30
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
SATTERTHWAITE JOSHUA P.;DINGMAN JAMES E.
分类号
H04B3/46
主分类号
H04B3/46
代理机构
代理人
主权项
地址
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