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rubber ball for a little physical culture, to warm up and for physical purposes
rubber ball for a little physical culture, to warm up and for physical purposes
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机译:橡胶球,用于一些体育锻炼,热身和体育锻炼
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摘要
A rubber ball designed for physical training, warm-up exercise, and physiotherapy, having an inflatable bladder and a laminated covering covered on the periphery of the bladder, the laminated covering being formed by: adhering a plurality of rubber strips to the bladder and then treating the rubber strips with a vulcanization process, the laminated covering being thicker and harder than the bladder.
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