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发明名称
DESIGN DEVICE
摘要
The invention is a design device in which the beads have keyways, and the axles on which they are mounted have keys engageable and disengageable from the keyways.
申请公布号
US3721022(A)
申请公布日期
1973.03.20
申请号
USD3721022
申请日期
1971.01.15
申请人
MERCORELLI J,US
发明人
MERCORELLI J,US
分类号
G09B11/00;(IPC1-7):G09B1/20
主分类号
G09B11/00
代理机构
代理人
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