发明授权
US5477814A Track system with exercise ball 失效
轨道系统与运动球

Track system with exercise ball
摘要:
An effective track system for guiding a rolling hamster ball includes straight and curved track sections, placed end to end. Each track section has a base and paired support rails protruding upwardly from the base for supporting and guiding the pet exercising ball along the track.
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