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Radio Record, Volume I, Issue 9, 16 September 1927, Page 15

‘A new transformer exhibited at the radio exposition in Brussels is screened in perforated metal, which, it is claimed, prevents its magnetic field from affecting a radio set. In_ addition to this, it carries a patented safety de yice which indicates by a distinct chauge of colour whenever high voltage is causing its windings to become too hot. The operator and the’ set ere thus protected.