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发明名称
Visual exercising device
摘要
申请公布号
US2718227(A)
申请公布日期
1955.09.20
申请号
US19540407186
申请日期
1954.01.29
申请人
POWELL ALFRED A
发明人
POWELL ALFRED A.
分类号
A61H5/00
主分类号
A61H5/00
代理机构
代理人
主权项
地址
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