Topping rubber composition for canvas chafer which provides good rim chafing resistance, durability, sheeting processability, and less heat build-up. The determination of the current SAR values ensues employing stored data that contain the time curve of the RF stressing of the patient during one or more preceding measurements, as well as information from which the temporal spacing of the RF stress of the preceding measurements from the planned measurement can be determined. The opening tapers into a narrower slot in the beat-up and drawing-off direction. A mechanism is provided within the passageway for exerting a bias force against the pressure responsive element which is sufficient to close the inlet opening to fluid flow absent a pre-established level of fluid pressure exerted on the pressure responsive element. The plurality of earth terminal pins are provided on the male connector body, and are accommodated in the earth terminal holes. Gas injection pins may be provided at the sterilization-sealing station to inject gas into the housing, between the first and second webs.