Abstract: A replaceable lens attachment system for respiratory devices and methods of use. The replaceable lens attachment system includes a face shield having rotatable attachment members and a replaceable lens. The rotatable attachment members include cams and flanges. The attachment system may further comprise a helmet respirator with support elements disposed thereon. The method includes bowing the lens and inserting it into the frame. The rotatable attachment members are rotated to urge the lens into the frame and cover the frame. The flanges and support elements provide impact resistance to the lens.

Abstract: An electrical drop wire connector for facilitating the connection of drop wires to overhead communication cables has spring compression reserve connection to both drop wire and cable wire. Test ports permit electrical testing of the installation. Easy access to the contact area for removal and replacement of drop wires is provided.

Abstract: An electrical terminal having a supporting body, a transversely perforate cap, and an enclosed tubular contact member having a bifurcate contact element in line with a wire cutting edge. Contact is established and excess wire removed by a twisting motion applied to the cap. Modular cross connect structure employing such terminals is described.

Abstract: An electrical wire connection in which an electrically conductive connector element in an insulating body makes electrical connection to the conductor of an insulated wire. The connector element has an open-ended hollow cylindrical wire connecting end formed with a pair of opposed V-shaped wire entrance areas leading into straight sided wire connecting slots and the wire is more deeply inserted into one slot than the other.