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公开(公告)号：US2921863A
公开(公告)日：1960-01-19
申请号：US75746158
申请日：1958-08-27
Applicant: WESTINGHOUSE ELECTRIC CORP
Inventor： SELBY JR ELMER E , PLUMMER WENDELL L , LEDERER ERNEST A
IPC: H01J9/22
CPC classification number: H01J9/223
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