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Pat. 9978490 United States, Int. Cl.22 B22F 3/105, B22F 1/02, B22F 3/12, B23K 26/00, H01F 1/24, H01F 1/33, H01F 3/08, H01F 41/02, H02M 7/44, H01F 37/00. Compact, method for producing compact : Appl. N 14/735465 : Filed 10.06.2015 : Pub. 22.05.2018 : / Kazushi Kusawake, Masato Uozumi, Atsushi Sato, Koji Yamaguchi, Mamoru Ono, Hiroyuki Murase, Kazuo Nakamae ; Assignee Sumitomo Electric Sintered Alloy Ltd, Sumitomo Electric Industries Ltd ; NN p. : patents.google.com : URL: https://patents.google.com/patent/US9978490/en?oq=US9978490.html (дата обращения: ДД.ММ.ГГГГ).