A food article end location detecting system for a food article slicing machine. The fully customizable design allows the surgeon to independently angle the retractor blades and expand the retractor in both cephalad-caudal and medial-lateral directions. A method of connecting a transition piece to PVC, ABS OR CPVC ductwork is also provided. A receiving unit receives the first electromagnetic signals transmitted by the transmission unit. If the memory access operation may involve cache coherent memory, then a cache coherency command may be issued that contains physical address information of the memory access operation. The first direction and the second direction are different from the horizontal direction and the perpendicular direction.