Portable stepping system

作者: Norma Wigutoff

DOI:

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摘要: A stepping platform includes an upper step and a lower platform. The may be manually moved from stored position to deployed, vice-versa. tread surface side walls that cooperate define cavity into which the fits when is in position. also walls. In one embodiment, height of about half overall Further, both platforms include areas sized support feet standing adult.

参考文章(4)
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