2984756 | Launching mechanical waves | 1961-05-16 | ||
2972068 | Uni-directional ultrasonic transducer | 1961-02-14 | ||
2822539 | Microwave radiation absorbers | 1958-02-04 | ||
2700738 | Delay-line end cell | 1955-01-25 | ||
2649550 | Reflection absorbing ultrasonic wedge | 1953-08-18 | ||
2430013 | Impedance matching means for mechanical waves | 1947-11-04 | ||
2415832 | Radiation absorber | 1947-02-18 |