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公开(公告)号：US2897366A
公开(公告)日：1959-07-28
申请号：US72561558
申请日：1958-04-01
Applicant: CANAL IND CORP
Inventor： COCHRAN LEE D
IPC: H01J37/09 , H01J37/153 , H01J37/21
CPC classification number: H01J37/09 , H01J37/153 , H01J37/21
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