359 / | HD | OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS |
196 | DF | DEFLECTION USING A MOVING ELEMENT OR MEDIUM (OFFSETTING OR CHANGING AT LEAST A PORTION OF THE BEAM) {3} |
197 | DF | .~ Using a periodically moving element (periodic change of optically reflecting, refracting or diffracting element) {6} |
204 | .~.~ Utilizing plural light beams |