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11.发明授权
公开(公告)号：US2486504A
公开(公告)日：1949-11-01
申请号：US75885647
申请日：1947-07-03
Applicant: JIRI STIVIN
Inventor： JIRI STIVIN
IPC: H05B6/04
CPC classification number: H05B6/04
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