Abstract: Sizing agent-free tangled multifilament yarn with an opening length of 1 to 6 cm and a knot strength of no more than 2, at least the majority of whose filaments have a thin film consisting mainly of hard wax constituting about 0.3 to 2% of the total weight of the filaments together with this film, and are glued, at least in places, via this film to adjacent filaments.

Abstract: A pulse generator composed of a stator, a part which is movable with respect to the stator, a coil of wire, at least one Wiegand wire, and at least one magnet which causes the Wiegand wire to generate pulses in the coil based on the Wiegand effect, upon movement of the movable part. The magnetic field produced by the magnet is of such an asymmetrical form with respect to the Wiegand wire that the pulses show a positive or negative polarity depending on the sense of movement of the movable part.

Abstract: A testing apparatus for an anti-lock control system for vehicle brakes for testing the correct functioning of the control system. In one embodiment, the apparatus establishes a predetermined speed and compares this predetermined speed to the speed sensed by the sensing portion of the control system. When the predetermined speed is exceeded by the moving vehicle a testing apparatus is triggered which initiates a test procedure for the control system. The apparatus includes a switching device to insure that a test procedure is initiated only after the vehicle ignition switch is actuated. In another embodiment, the apparatus employs a temperature sensor and/or the control system output for initiating a test procedure, but not during a deceleration of the vehicle. In a further variant, two threshold levels are established, each of which must be encountered before the test procedure is initiated.

Abstract: An antilocking control system for the wheel brakes of a vehicle, which system includes two identically designed control units for various wheels of the vehicle and with each control unit comprising at least one wheel speed sensor, an evaluation circuit for evaluating the output signals from the sensors and for producing control signals and a brake pressure control unit responsive to the control signals from the evaluation circuit, as well as a device for testing the operability of the antilocking control system at desired time intervals. The testing device, upon receipt of a start instruction, simultaneously feeds at least one identical test signal to each of the two control units, and then compares the effect of the test signal on the two control units by comparing output signals from the two control units at given corresponding points in the two control units for at least approximate coincidence with respect to the timely occurrence and/or the magnitude of the signals and generates a control signal, e.g.