| 73 / | HD | MEASURING AND TESTING |
|
| 570 | DF | VIBRATION {10} |
| 584 | DF | .~ By mechanical waves {13} |
| 596 | DF | .~.~ Beamed {10} |
| 609 | DF | .~.~.~ Measuring or testing system having threshold, gating, delay, or blocking means {2} |
| 610 |  | .~.~.~.~ Electronic gating {6} |
| 611 | DF | .~.~.~.~.~> Adjustably responsive to information signal |
| 612 | DF | .~.~.~.~.~> Plural gating |
| 613 | DF | .~.~.~.~.~> Of noise |
| 614 | DF | .~.~.~.~.~> Of signals to pass only echoes from within test body |
| 615 | DF | .~.~.~.~.~> Of signals to pass only echoes from front surface or flaw and from rear surface of test body |
| 616 | DF | .~.~.~.~.~> Of signals to pass only echoes from rear surface of test body |