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公开(公告)号:US2998440A
公开(公告)日:1961-08-29
申请号:US63146056
申请日:1956-12-31
Applicant: ETHYL CORP
Inventor: FOSTER WALTER E , KOENIG PAUL E
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公开(公告)号:US2998407A
公开(公告)日:1961-08-29
申请号:US62847556
申请日:1956-12-17
Applicant: ETHYL CORP
Inventor: FOSTER WALTER E , KOENIG PAUL E
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公开(公告)号:CA647027A
公开(公告)日:1962-08-21
申请号:CA647027D
Applicant: ETHYL CORP
Inventor: KOENIG PAUL E , FOSTER WALTER E
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