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Educational apparatus
专利权人:
Abdulkarim Ali Al-Motawwah
发明人:
Abdulkarim Ali Al-Motawwah
申请号:
US11677069
公开号:
US09039421B2
申请日:
2007.02.21
申请国别(地区):
US
年份:
2015
代理人:
摘要:
An educational apparatus for educating, testing and entertaining individuals includes a rotatable spherical element, a planar support structure and a plurality of rollers for supporting the spherical element for rotational movement. The planar support structure defines an elevated planar surface with a circular opening therein. The rotatable rollers are hingedly mounted to the planar support structure around the opening for supporting the spherical element with a majority of the spherical element above the level of the planar support structure. A fixed element is fixed to the spherical element and a magnetic complimentary element is disposed adjacent the spherical element for contact by the fixed element.
来源网站:
中国工程科技知识中心
来源网址:
http://www.ckcest.cn/home/

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