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公开(公告)号：US2422611A
公开(公告)日：1947-06-17
申请号：US31441240
申请日：1940-01-18
Applicant: HELMUT BECKER , HEINRICH BROSCHKE
Inventor： HELMUT BECKER , HEINRICH BROSCHKE
IPC: G02B21/00
CPC classification number: G02B21/0016
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