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SOFTBALL THROWING AND PITCHING SPIN TRAINER
SOFTBALL THROWING AND PITCHING SPIN TRAINER
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机译:软式投掷和俯仰旋转训练器
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摘要
The present invention compromises a novel softball training aid that accelerates the ability an understanding of throwing and spinning a softball in different orientations. In various embodiments the invention will help create and maintain a more effective pitcher and/or softball player
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