Compressional wave transducer

作者: Richard W Samsel

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参考文章(8)
Alfred L W Williams, Focused electromechanical device ,(1949)
Alfred Leslie W Williams, Hydraulic electromechanical transducer ,(1947)
Daniel Smith Frederick, Andrews Mcgeachy James, Beaumont Wood Albert, Measurement of distances by echo reception methods ,(1932)