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Problems Associated with Gambling A Preliminary Investigation into Health, Social and Psychological Aspects

A free piston internal combustion engine includes a combustion cylinder having an inside surface. A piston is reciprocally disposed within the combustion cylinder. The piston includes a piston head and a plunger rod attached to the piston head. The piston head has an outside surface lying closely adjacent to and defining a bearing surface with the inside surface of the combustion cylinder. The bearing surface consists essentially of a non-metallic material.