发明授权
- 专利标题: Subscriber line testing apparatus
- 专利标题(中): 订户线测试设备
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申请号: EP81107778.3申请日: 1981-09-30
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公开(公告)号: EP0049471B1公开(公告)日: 1985-05-02
- 发明人: Kojima, Takafumi , Tamaki, Kenzo , Yokota, Shiro
- 申请人: Hitachi, Ltd. , Nippon Telegraph and Telephone Public Corporation
- 申请人地址: 5-1, Marunouchi 1-chome Chiyoda-ku, Tokyo 100 JP
- 专利权人: Hitachi, Ltd.,Nippon Telegraph and Telephone Public Corporation
- 当前专利权人: Hitachi, Ltd.,Nippon Telegraph and Telephone Public Corporation
- 当前专利权人地址: 5-1, Marunouchi 1-chome Chiyoda-ku, Tokyo 100 JP
- 代理机构: Beetz & Partner Patentanwälte
- 优先权: JP139868/80 19801008
- 主分类号: H04M3/30
- IPC分类号: H04M3/30 ; H04Q11/04
公开/授权文献
- EP0049471A1 Subscriber line testing apparatus 公开/授权日:1982-04-14
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