Abstract: The invention relates to a tennis training apparatus, comprising a support bar (5) joined in an articulated manner to a base (B, 6) and pivotable between a first (8) and a second stop (9) and which supports in a pivotable manner a profiled rod (3) protruding from the support bar (5), at the free end of the profiled rod (3) a ball (1) is rotatably supported, wherein the second stop (9) in direction of stroke is pivotably supported against a force.

Abstract: A golf ball including, as a composing element, a hot-molded product obtained from a rubber composition. The rubber composition includes: a polybutadiene obtained by mixing a polybutadiene (a) with a polybutadiene (b) at a mass ratio [(a)/(b)] ranging from 70/30 to 10/90, an unsaturated carboxylic acid and/or a metal salt thereof, and an organic peroxide. The polybutadiene (a) contains 60% or more of cis-1,4-bonds and has a Mooney viscosity [ML1+4(100° C.)] of 10 or more and less than 50, and is synthesized by using a group VIII element catalyst, and the polybutadiene (b) contains 60% or more of cis-1,4-bonds and has a Mooney viscosity [ML1+4(100° C.)] of 50 or more, and is synthesized by using a rare earth element based catalyst.

Abstract: A board trimmer having pre-trimmer saws includes a selectively translatable upstream first pre-trimmer saw mounted on a near-side of a board flow path of a board transfer, upstream of a downstream multi-saw board trimmer. The pre-trimmer saw is selectively translatable by an actuator for translation linearly parallel to a near-side ended board on the board transfer. The pre-trimmer saw is perpendicular to the board when on the board transfer. A board elevator may be mounted below the board flow path and the pre-trimmer saw for elevating the board from a sequence of single boards from the board transfer into sawing engagement with the pre-trimmer saw once the pre-trimmer saw has been pre-positioned by the actuator into an optimized cutting path. Trimming of the board in the flow path is done according to an optimized solution for trimming the board.