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发明名称
A level for indicating that a corner is vertical
摘要
申请公布号
GB2279741(A)
申请公布日期
1995.01.11
申请号
GB19930014191
申请日期
1993.07.09
申请人
ROBERT GEORGE * EMMS
发明人
ROBERT GEORGE * EMMS
分类号
E04G21/18;G01C9/28;(IPC1-7):G01C9/28
主分类号
E04G21/18
代理机构
代理人
主权项
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