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发明名称
Improved device for passing electric cables through the roofs of buildings
摘要
申请公布号
GB338332(A)
申请公布日期
1930.11.20
申请号
GB19290032756
申请日期
1929.10.28
申请人
WILHELM PETER
发明人
分类号
H02G3/22
主分类号
H02G3/22
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代理人
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