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发明名称
Improvements in or relating to apparatus for the detection of cracks in ferrous metals by magnetic means
摘要
申请公布号
GB547991(A)
申请公布日期
1942.09.21
申请号
GB19410010228
申请日期
1941.08.12
申请人
LAWRENCE JOHNSON
发明人
分类号
G01N27/84
主分类号
G01N27/84
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