1. Pitch surfaces are the imaginary planes, cylinders, or cones that roll together without slipping.2. The pitch plane of a rack or crown gear is also the pitch surface . 3. The slippery pitch surface and tough tackling by the Poles thwarted Portugal's slick passing game. 4. It is properly the radius of curvature of the pitch surface in the given cross section. 5. A pitch plane in an individual gear may be any plane tangent to its pitch surface . 6. The pitch surface is artificial and it had to be relaid in 2008 at FIFA's request. 7. Neither the referee, the Premier League nor ourselves had been notified of the change in pitch surface . 8. This definition is applicable to every type of gear for which a pitch surface can be defined. 9. The "'pitch plane "'of a pair of gears is the plane perpendicular to the axial plane and tangent to the pitch surfaces . 10. The 3G pitch surface is estimated to be used for a total of 90 hours with 2, 200 players using it weekly.
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