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1.发明授权
公开(公告)号：US3551748A
公开(公告)日：1970-12-29
申请号：US3551748D
申请日：1968-10-10
Applicant: SMITH CORP A O
Inventor： MAYNARD JOHN T , LUNZ JOHN E
CPC classification number: H02H11/004 , H02H3/253 , H02P7/2913
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