A delay-locked loop circuit generates a first clock signal. The organosilicon compounds may be used in rubber mixtures. The condensed refrigerant is passed through the energy recovery device to expand the refrigerant. Soybean seed, cells, plants, germplasm, breeding lines, varieties, and plant parts produced by these methods andor derived from soybean variety XB21F12 are further provided. A headband is provided to which the clamp may be attached. According to the invention, the surface is formed in an insert produced separately and fixed to the rocker arm.