600 / | HD | SURGERY |
300 | DF | DIAGNOSTIC TESTING {38} |
407 | DF | .~ Detecting nuclear, electromagnetic, or ultrasonic radiation {11} |
437 | DF | .~.~ Ultrasonic {10} |
459 | DF | .~.~.~ Structure of transducer or probe assembly {3} |
472 | .~.~.~.~ With beam directing or shaping means in the wave path (e.g., lens, reflector) |