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公开(公告)号：US3490226A
公开(公告)日：1970-01-20
申请号：US3490226D
申请日：1967-11-20
Applicant: GEN TIME CORP
Inventor： ANDERSON WILMER C , ALTMAN LOUIS
IPC: G04B19/30
CPC classification number: G04B19/30
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