Abstract: A locking mechanism for a communication device (100) is provided by an access cover (102) having a simple user interface with rugged features that prevent the access door from detaching if the device is dropped. The access cover (102) includes a latch (106) movable vertically in up and down positions (112, 114) in combination with a slideable lock (110) movable horizontally in side to side positions, one of the side positions preventing up and down movement of the latch. A single lock icon (120) is disposed across the latch (106) and slideable lock (110) such that an unlocked position (118) is indicated when the latch moves up and down (112, 114), and a locked position (116) is indicated when the slideable lock (110) is slid to the side position that prevents up and down movement of the latch.

Abstract: A well screen having slurry flow paths enclosed therein includes support rods extending in the axial direction of the screen disposed cylindrically at a predetermined interval in the circumferential direction of the screen, a wire wound on the outer periphery of said support rods so as to form slits of a predetermined width, one or more flow paths for gravel-containing slurry provided inside of the wire and extending in the axial direction of the screen, and openings for communicating the flow paths with the outside of the screen. Lowering and lifting of the screen through a wellbore can be made smoothly without interfering of the slurry flow paths with the wellbore and installation of the screen can thereby be facilitated.