172330 ⎘
Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using electromagnetic waves other than radio waves; Systems for determining direction or deviation from predetermined direction using rotating reticles producing a direction-dependent modulation characteristic
Sub-classes:THREE-DIMENSIONAL HOLOGRAPHIC DISPLAY USING MULTIPLE PINHOLES AND METHOD OF OPERATING THE SAME
#2Warning receiver for detecting and characterizing an optical source
#3Three-dimensional holographic display using multiple pinholes and method of operating the same
#4Human body sensing device and image forming apparatus having the same
#5Projectile seeker