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发明名称
DRAWING AID FOR PRODUCING HATCHING
摘要
申请公布号
GB9006350(D0)
申请公布日期
1990.05.16
申请号
GB19900006350
申请日期
1990.03.21
申请人
DARBY, PETER
发明人
分类号
主分类号
代理机构
代理人
主权项
地址
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