434 / | HD | EDUCATION AND DEMONSTRATION |
1 | DF | DETECTION OR RANGE DETERMINATION OF DISTANT OBJECT BY APPARATUS USING SENSOR OF ELECTROMAGNETIC OR SOUND ENERGY {2} |
2 | DF | .~ Radar {3} |
4 | .~.~ Optical means (e.g., image projector, etc.) or light or sound sensor (e.g., television camera, microphone, etc.) included in a simulator |