. "Further, display device 522 includes a light transmitting lens cover or cover element 538 that covers and substantially seals the passageways 530 c at the front surface 530 b of display receiving portion 530 to limit or substantially preclude dirt, debris, water and other elements and/or contaminants from being received at the outer ends of the passageways so as to keep the passageways clear and t" . . . .