| 摘要 |
I disclose a batting practice device comprising a support, a relatively rigid arm structure rotatably mounted on said support and having a practice ball or similar projectile mounted adjacent its outward free end, and biasing means non-rotatably secured to said support and to said arm structure at a point remote from said support for storing at least a portion of the kinetic energy of said ball as said arm structure rotates after said ball is struck by a user of said device.
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