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公开(公告)号:DK120075A
公开(公告)日:1975-09-27
申请号:DK120075
申请日:1975-03-21
Applicant: GERZON M A
Inventor: GERZON M A
IPC: H04H20/88 , H04R3/00 , H04S3/00 , H04S3/02 , H04R