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公开(公告)号：US3207294A
公开(公告)日：1965-09-21
申请号：US16816862
申请日：1962-01-23
Applicant: UNION CARBIDE CORP
Inventor： FARRAR MILLARD B , REASH CLAIR W , WAIT DWIGHT N
IPC: H01J7/18
CPC classification number: H01J7/186
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