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发明名称
Improvements in and relating to miners' electric safety lamps
摘要
申请公布号
GB344966(A)
申请公布日期
1931.03.19
申请号
GB19290039358
申请日期
1929.12.23
申请人
GEORGE PEARSON
发明人
分类号
F21L4/00
主分类号
F21L4/00
代理机构
代理人
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