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发明名称
Improvements in spirit-levels
摘要
申请公布号
GB621909(A)
申请公布日期
1949.04.22
申请号
GB19460033974
申请日期
1946.11.15
申请人
OSCAR KUMLIN;GUSTAV GEORG CARLSSON
发明人
分类号
G01C9/28
主分类号
G01C9/28
代理机构
代理人
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