A truck bed cover lock having two locking units positioned to interact with the existing latch locks present on most bed covers. Each of the woven layers comprising a straight yarn in the warp of the weave pattern with the weaves of the layers being oriented at a 90 degree angle to one another. The distance of the bottom of the second blade groove from the upper surface of the blade bar deviates from the distance of the bottom of the first blade groove from the upper surface of the blade bar at substantially the same distance from the feed edge of the refining surface. A ventilating gap is defined between a face of the cylinder head fastened by the fastening bolts and a bottom wall of the valve-operating chamber. Engagement structure is included for securing the outer padded tongue to cover the inner tongue portion, with the engagement structure located at least partially under the outer padded tongue portion. In the system and method, an inputoutput memory management unit receives a peripheral page request from a peripheral.