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1.An assembly for counting marking impulses in an automatic telephone system 失效
Title translation: 一种用于计数自动电话系统中标记脉冲的组件公开(公告)号:US3017611A
公开(公告)日:1962-01-16
申请号:US66850157
申请日:1957-06-27
Applicant: ERICSSON TELEFON AB L M
Inventor: ERIK STEMME NILS GUSTAV