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发明名称
DEVICE FOR DEMONSTRATING RULED SURFACES
摘要
申请公布号
SU1377890(A1)
申请公布日期
1988.02.28
申请号
SU19833683268
申请日期
1983.11.24
申请人
YURASOV YURIJ V,SU
发明人
YURASOV YURIJ V,SU
分类号
G09B23/04
主分类号
G09B23/04
代理机构
代理人
主权项
地址
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