Improvements in the object of the principal of which patent are characterized by forming the floor constituting the field following an undulated profile formed by a series of prominences and transverse depressions relative to the longitudinal axis of the table whose depressions correspond to concentric arcs with describing the feet of the figure or player spins on the actuator rod being the line through the center of the curves are straight or wavy surface parallel to the longitudinal axis of the table.
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