| http://www.w3.org/ns/prov#value | - Agent: Oliff & Berridge, Plc20090022992 - Oxide-type, magnetic material and its production method, and sintered ferrite magnet and its production method: A sintered ferrite magnet having an M-type ferrite structure and comprising Ca, an R element which is at least one rare earth element indispensably including La, Ba, Fe and Co as indispensab
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