| 摘要 |
Nondirectional magnetic equipment for inspecting billet of various types material board etc. was composed of a pair of coil which intersected the 1st coil and the 2nd coil. AC was supplied to each coil of the nondirectional magnetic inspecting equipment, two coil winding ratio being such that surface stratification could produce rotating magnetism, when a testing material was inserted in the intersecting coil.
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