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发明名称
Trigonometric identifier
摘要
申请公布号
US2234896(A)
申请公布日期
1941.03.11
申请号
US19400320213
申请日期
1940.02.21
申请人
DE TURK WILLIAM NELSON
发明人
TURK WILLIAM NELSON DE
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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