Abstract: The present invention is a hand operated throttle control system for use h a fuel flow control mounted on an internal combustion engine. A hand piece assembly mounted on the vehicle rotated has an actuator so rotation of the hand piece causes a corresponding rotation of the housing. The actuator has a hydraulic structure which uses the rotation of the hand piece to cause a corresponding hydraulic pressure to cause fuel control modification.

Abstract: Disclosed is a jacket worn on the thumb or finger for abrading a work piece and enhancing the ability of the thumb or finger to tractively grip the work piece. The jacket comprises an elongate sleeve open at one end, a deformable nonplanar region on the sleeve and abrasive elements on the nonplanar region. The abrasive elements include a layer of abrasive material which defines a primary digging edge. The abrasive elements also include an underlying substrate layer stiffer than the deformable nonplanar region.

Abstract: A rotatable lever and an initially transversely disposed adjustable linkage echanism for attachment in predetermined relation to at least one movable work-performing arm and operable such that upon rotation of the lever and linkage mechanism responsive to pivotal rotary movement of the lever portion thru a designated travel arc of at least approximately 90.degree., the movable arm moves much more rapidly during the first approximate one-half to three-quarters of its designated travel arc, and thereafter continues to move progressively slower in a firm positive manner thru the remainder of the travel arc, while moving from its transverse relationship to a generally parallel or linearly aligned relationship. This simplified mechanism is non-servo in character and relatively low cost compared to servo devices embodying continuous sensing and feedback circuitry. Among various uses are easy association with various known industrial type robot devices embodying programmed control of articulated mechanical arms.