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Publication of GB246359ApublicationCriticalpatent/GB246359A/en
246,359. Carpmael, A., (Telefunken Ges. fur Drahtlose Telegraphie). May 4, 1925. Inductances. - The cores of inductance coils for use in telegraphy and telephony by highfrequency oscillations are formed of wire of a nickel-iron alloy and having a diameter of less than <1>/10 mm. The alloy used preferably contains about 80 per cent nickel and 20 per cent iron.