359 / | HD | OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS |
838 | DF | MIRROR {14} |
850 | DF | .~ Plural mirrors or reflecting surfaces {7} |
857 | DF | .~.~ With successive reflections {4} |
862 | .~.~.~ Including an adjustable mirror {1} | |
863 | DF | .~.~.~.~> Including a curved mirror |