Abstract: A recovery device for use in an airborne vehicle is described. The recovery device includes a base plate, a winch coupled to the base plate, and an anchoring device coupled to the base plate to detachably couple the base plate to the airborne vehicle. A recovery system for a helicopter that has a support arm extending from its exterior fuselage is also described. The recovery system includes a recovery device that is a base plate, a mechanically-operated winch coupled to the base plate, and an anchoring device to detachably couple the base plate to the interior floor of the helicopter. The recovery system further includes a pulley detachably coupled to the support arm and a cord coupled to the winch and extending through the pulley.

Abstract: A method and apparatus for checking an envelope for contents is provided to determine whether or not an envelope has been completely emptied. The thickness of the envelope is measured at a plurality of points along the envelope. From the measured thickness, the thickness, or an integer multiple of the thickness, of the material of the envelope is determined. The thickness of the envelope measured at the plurality of points is compared with the determined material thickness, or integer multiple of the thickness, of the envelope. On the basis of that comparison, a determination is made as to whether or not the envelope has contents therein. The apparatus and method do not rely on measuring the opacity of the envelope.

Abstract: A hanger for hanging an object in an elevated position. The hanger includes a receptacle fixed on its shaft for receiving an extension implement such as a broom handle. In the preferred embodiment, the receptacle is a loop formed integrally from the material of the hanger. The extension implement is inserted into the receptacle and the hanger is lifted to the elevated position for fastening. The receptacle may take a variety of shapes and sizes, and may be fixed at any position on the hanger.