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公开(公告)号：US1855669A
公开(公告)日：1932-04-26
申请号：US29191328
申请日：1928-07-11
Applicant: CLEVELAND CLINIC FOUNDATION
Inventor： OTTO GLASSER , SEITZ VALENTINE B
IPC: H01J47/04
CPC classification number: H01J47/04
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