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发明名称
IMPROVEMENTS IN OR RELATING TO MAINTENANCE
摘要
申请公布号
GB9024009(D0)
申请公布日期
1990.12.19
申请号
GB19900024009
申请日期
1990.11.05
申请人
BALL, DOUGLAS
发明人
分类号
E04H5/04;E06B5/00
主分类号
E04H5/04
代理机构
代理人
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