| 摘要 |
A game call comprising a main body forming a resonant chamber having a whistle vent and at least one opening adapted to be closed and opened by finger contact, a mouthpiece at one end of the resonant chamber, a roller suspended within the resonant chamber and aligned transverse to the longitudinal axis of the mouthpiece, the roller adapted to freely rotate about its longitudinal axis and a resonant chamber volume adjuster, the volume adjuster is adapted to selectively change the volume of the resonant chamber whereby the oscillation rate of said roller may be varied to control the sound emitted by the game call.
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