Abstract: A louver assembly adapted to be mounted to the rear window assembly of an automotive vehicle, having an end cap construction and a plurality of elongated channel members, the end cap construction having a plurality of identical right hand end caps and a plurality of similar but reverse formed left hand end caps, a pair of side rails to receive the end caps, a detent structure for locating and securing the channel members in alignment with the associated one of the end caps, the channel member being of a preselected length to connect right hand and left hand end caps in a predetermined spaced relationship whereby the louver assembly will be of the desired width to fit the rear window assembly, the side rails being of a preselected length to accept a selected number of associated end caps whereby the louver assembly will be of the desired length to fit the rear window assembly, an adjustable hinge assembly to permit pivotal movement of the louver assembly relative to the window assembly and being adjustable to

Abstract: An annular blowout preventer having a body with a central bore, a piston chamber, and a packer chamber surrounding the central bore, a piston in the piston chamber, an annular packer in the packer chamber, the annular packer including a resilient annulus and a plurality of metal irising inserts embedded in the annulus and having upper triangular plates, lower triangular plates, a stem connecting the plates and means interconnecting adjoining plates to avoid inadvertent separation of one or more of said inserts, the annular packer moving between open and closed positions responsive to movement of the piston.