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发明名称
Apparatus designed to illustrate the laws of economics by physical analogies
摘要
申请公布号
US2132514(A)
申请公布日期
1938.10.11
申请号
US19370167559
申请日期
1937.10.06
申请人
MOONEY JAMES D
发明人
MOONEY JAMES D.
分类号
G09B19/18
主分类号
G09B19/18
代理机构
代理人
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