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发明名称
Device and method for demonstrating the measurement of angles
摘要
申请公布号
US3377718(A)
申请公布日期
1968.04.16
申请号
US19650500778
申请日期
1965.10.22
申请人
ANTRAN CORPORATION
发明人
SAVIN CORNELIUS;VORWALD ALAN G.;VAGTS CHRISTOPHER R.
分类号
G09B23/04
主分类号
G09B23/04
代理机构
代理人
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地址
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