Abstract: A nozzle system comprising a nozzle connected to a first supply conduit having an enclosed second supply conduit. The first supply conduit at the proximal end is connected to a first source of medium while the second supply conduit at the proximal end is connected to a second source of medium. The first supply conduit at the distal end is connected to nozzle openings that discharges first medium which propels said nozzle system through a pipe line and removes debris from said pipe line. The second supply conduit at the distal end is connected to a nozzle sprayer that discharges a second medium directed forward from the first supply conduit.

Abstract: A highly compact and lightweight exercise machine which, in one unit, includes the features of a bicycle ergometer and of a rope pulling machine. The resistance to the movement of the bicycle ergometer and rope pulling machine features is provided by the same resistance apparatus. The resistance apparatus includes a metallic disk which is connected to the bicycle ergometer and rope pulling features and which rotates near a source of magnetism. The interaction between the rotating disk and the source of magnetism creates electromagnetic forces which exert drag on the disk. The exercise machine is constructed so that all rotatable components require only two shafts, which construction significantly reduces the space requirements of the exercise machine components. A differential pulley system is incorporated in the exercise machine and amplifies the resistance produced by the resistance apparatus.