Spot-welding transformer (Rankin Kennedy, Electrical Installations, Vol II, 1909).jpg
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Spot welding transformer (Rankin Kennedy, Electrical Installations, Vol II, 1909), Scans from 'Rankin Kennedy, Electrical Installations, Vol II', 1909, Scans from 'Rankin Kennedy, Electrical Installations, Vol II', 1903/undescribed
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スポット溶接変圧器
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spot welding spot weld rankin electrical work electrical dissimilar welding step-down transformer step-up transformer primary coil secondary coil