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公开(公告)号：US2969888A
公开(公告)日：1961-01-31
申请号：US69374757
申请日：1957-10-31
Applicant: LEESONA CORP
Inventor： WHITING THEODORE A
IPC: H01F41/06
CPC classification number: H01F41/063 , Y10T83/8722 , Y10T83/8786 , Y10T83/8802 , Y10T156/1343 , Y10T225/321
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