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body weight-bearing perfected for pupils swimmers or like
body weight-bearing perfected for pupils swimmers or like
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机译:适合小学生游泳者或类似人士的承重
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摘要
A buoyancy device, especially for persons learning to swim in the form of a buoyant ring adapted to be placed over the head of the person and engage the chin and nape of the neck. The ring is either inflatable or of a material lighter than water, and has an inner slit to enable the person to put his hand in it.
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