359 / | HD | OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS |
591 | DF | BUILDING INTERIOR ILLUMINATION WITH REFLECTED, REFRACTED OR PREDETERMINED ANGLE OF ENTRANCE OF OUTSIDE LIGHT {3} |
592 | DF | .~ Unitary light transmitting member comprising plural reflecting or refracting elements {3} |
594 | .~.~ Elements on two sides of member |