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Publication of GB659215ApublicationCriticalpatent/GB659215A/en
659,215. Magnetic dust structures. BRITISH THOMSON-HOUSTON CO., Ltd. May 6, 1949, No. 12164. Convention date, May 7, 1948. Drawings to Specification. [Class 38 (ii)] [Also in Groups XXXVII and XL (a)] A permanent magnet comprises a sintered mixture of 30 parts of Fe 2 O 3' 44 parts of Fe 3 O 4 , and 26 parts of CO 2 O 3 .