Abstract: There is provided a cylindrical valve 20 for placement in the flow path of a singlet-delta oxygen generator 12 that feeds O.sub.2.sup.* to a chemical laser gain medium 14. The feed path 22 includes a sharp 90.degree. bend 24 that causes fluid velocity variations in O.sub.2.sup.* entering the gain medium 14. Integral with the valve 20 is a tubular structure 12 having a partial circumferential radially extending surface 44 fitted with "O" ring for sealing and opening the feed path between the "O.sub.2.sup.* " generator 12 and gain generator 14. A series of vanes 32, 34, 36 disposed in velocity control zones 50, 52, 54 and 56 are integral with the valve 20 for leveling out the velocity variations and controlling the wake formation 58, 59 and 60 in the O.sub.2.sup.* entering the gain generator 14.

Abstract: Invalid lift apparatus particularly adapted for installation in an automotive vehicle of the van type characterized by a passenger side door adjoining a loading floor. The apparatus includes a storage receptacle mountable below the loading floor to receive a platform for wheelchair passengers. The platform is extensible onto movable supports for raising and lowering relative to fixed supports attachable at opposite sides of the door opening. Limit switches are provided to control the extent of upward and downward movement of the platform, and to orient the platform in proper position for movement out of the way and onto the storage receptacle whereby ambulatory passengers can enter and leave the vehicle.