Wenderoth, Lind & Ponack
Inboard type magnetic system for electro-dynamic transducer
 An inboard type magnetic system for an electrodynamic transducer which has a reduced height and magnetic flux leakage by making use of a manganese-aluminum-carbon system alloy magnet anisotropized by warm extrusion. 
Matsushita Electric Industrial Company Limited
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H01F H04R Y10T H04R H01F
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Sadao Takashi Hisashi Isago Tadao Takao Nobuyuki
Yukimoto Matsumoto Yoshimura Konno Ohtani Kubo Kato