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公开(公告)号：US1941421A
公开(公告)日：1933-12-26
申请号：US18873027
申请日：1927-05-04
Applicant: OLD COLONY TRUST COMPANY
Inventor： CHARLES SPACTH , HERBERT PEARY
IPC: H01J17/00
CPC classification number: H01J17/00 , H01J2893/0064
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