| 摘要 |
An aquatic amusement device having forward and aft fins which are secured to a two part longitudinal shaft so the fins rotate on the same axis and with relative rotational motion. The device can be towed behind a boat, winch or other towing apparatus, the rider being positioned behind the device while grasping a handle secured to the aft fins. The device provides excellent maneuverability on or below the surface of the water.
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