Patent classifications
H
ELECTRICITY
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H01
ELECTRIC ELEMENTS
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H01F
MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
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Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
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H01F1/44
of magnetic liquids, e.g. ferrofluids
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H01F1/445
the magnetic component being a compound, e.g. Fe3O4
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