Abstract: A method of determining the temperature, preferably the ice boundary temperature, of an electrical resistive heating element of a de-icing system for airplanes, helicopters, and the like, preferably for a fully automatic control of the heating times of the heating elements. Additional temperature sensors are avoided and circuitry costs are substantially reduced by using the resistive heating elements themselves for determining the temperature. The resistance variation due to temperature variations of an element is ascertained by a current-voltage measurement, and a temperature variation of the element is determined from the resistance variation while using the temperature coefficient. The current-voltage measurement may be based on Ohm's law with a following analog or digital processing of the signal.

Abstract: An apparatus for the production of plastic cages for radial roller bearings wherein the two end rings of the cage are joined by a plurality of crossbars distributed over their circumference comprising an injection-molding die with a cylindrical core corresponding to the inner diameter of the cage and an outer die element having radially moveable slides, the said injection-molding die being provided with recesses for the simultaneous production of at least two cages.