By Mechanical Waves Patents (Class 73/584)
- Velocity or propagation time measurement (Class 73/597)
- Attenuation measurement (Class 73/599)
- Having plural, diverse forms of radiant energy (Class 73/601)
- With signal analyzing or mathematical processing (Class 73/602)
- Acoustic holography (Class 73/603)
- Imaging of discontinuity with stationary sonic transmitter (Class 73/606)
- Measuring or testing system having threshold, gating, delay, or blocking means (Class 73/609)
- Measuring or testing system having scanning means (Class 73/618)
- By reflected wave (Class 73/627)
- Sonic wave transmitter or receiver transducer (Class 73/632)