Pulse echo altimeter with mechanically driven indicator

作者: Randall C Ballard

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参考文章(4)
Donald S Bond, Radio pulse transmission system ,(1942)
Rost Helge Fabian, Thunell Karl Harry, Claesson Per Harry Elias, Vigren Sten Daniel, Stabilizing means for the control of a frequency modulated ultrashort wave transmitter ,(1942)
Pensyl Mary P, Mozley Robert F, Phase control apparatus ,(1944)
Bernard M Oliver, Object locating system ,(1945)