A seed tube guard for agricultural planters is cast from a high-chrome cast-iron alloy or manufactured from other wear-resistant material. In accordance with a first aspect, an apparatus is provided that is adapted to assist in weight loss and exercise. The pair of engaging gears according to this invention have advantages of reducing the fluid leakage, canceling the inertia of the rotors, and minimizing the vibration and noise. A master MUDS is generated by combining the MUDS maintained by each process, the master MUDS having bits set to a value of 0 for free memory blocks, and the master MUDS having bits set to a value of 1 for memory blocks allocated to any processes of the multiprocess computer system.