发明授权
- 专利标题: Telephone system
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申请号: US36252140申请日: 1940-10-24
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公开(公告)号: US2313815A公开(公告)日: 1943-03-16
- 发明人: PLAYFAIR FAIRBAIRN ERIC
- 申请人: GEN ELECTRIC CO LTD
- 专利权人: Gen Electric Co Ltd
- 当前专利权人: Gen Electric Co Ltd
- 优先权: GB2313815X 1939-10-31
- 主分类号: H04M1/76
- IPC分类号: H04M1/76