Abstract: A safe lighting system using wall mounted lift comprises a polygonal pipe cylinder installing at a building wall; a polygonal lifting unit moving up and down along the inner wall of the polygonal pipe cylinder; a wire adjusting the height of the polygonal lifting unit, wherein the wire is connected to the upper side of the polygonal lifting unit; a lifting control unit controlling the height of the polygonal lifting unit by winding or releasing the wire; and a lighting apparatus installed at the polygonal lifting unit, wherein the height of the lighting apparatus is adjusted by the lifting control unit, and the installation and the maintenance of the lighting apparatus can be done conveniently on the ground by lowering the lighting apparatus.

Abstract: The process of forming an electret nonwoven web, the process including the steps of providing a nonwoven web, generating a DC corona discharge from an apparatus including an anode electrically configured as a parallel device, and subjecting the web to DC corona discharge to form an electret.

Abstract: A traffic crossing signal mast for railroad-highway grade crossings incorporates a sturdy cantilever arm extending over the highway and supporting a maintenance catwalk. A short, horizontal jury mast at the end of the cantilever arm is pivotable about its axis parallel to the highway direction through limited angular sectors of one-quarter turn clockwise and counterclockwise. A junction box assembly mounted at each end of the jury mast suspends a pair of warning flasher crossing signal lamps on each side of the catwalk aimed down the highway axis. Pivoting movement of the jury mast from its locked, detent position to a latched quarter-turned position raises one of each pair of signal lamps for initial cable connections, repairs or replacement of flashing lamp heads. A lockable clamping cam lever disengages the detent for jury mast rotation and re-engages it to secure the signal lamps in their aligned position for use.