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经营范围
发明名称
Educational device for use in learning to tie certain knots
摘要
申请公布号
US2624957(A)
申请公布日期
1953.01.13
申请号
US19500155734
申请日期
1950.04.13
申请人
COLLINS ROBERT N
发明人
COLLINS ROBERT N.
分类号
G09B25/00
主分类号
G09B25/00
代理机构
代理人
主权项
地址
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