- 专利标题: Piezo-electric crystal control system
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申请号: US19088427申请日: 1927-05-12
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公开(公告)号: US1788239A公开(公告)日: 1931-01-06
- 发明人: AUGUST HUND
- 申请人: FED TELEGRAPH CO
- 专利权人: Fed Telegraph Co
- 当前专利权人: Fed Telegraph Co
- 优先权: US19088427 1927-05-12
- 主分类号: H03B5/34
- IPC分类号: H03B5/34