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发明名称
Construction of philosophical apparatus and models
摘要
申请公布号
US1838394(A)
申请公布日期
1931.12.29
申请号
US19280250021
申请日期
1928.01.27
申请人
WILLIAM HANSEL CARL
发明人
HANSEL CARL WILLIAM
分类号
G09B23/00
主分类号
G09B23/00
代理机构
代理人
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