发明授权
US1455478A Automatic starting and stopping attachment for disk-type talking machines 失效
自动启动和停止磁盘式通话机的附件

  • 专利标题: Automatic starting and stopping attachment for disk-type talking machines
  • 专利标题(中): 自动启动和停止磁盘式通话机的附件
  • 申请号: US52269321
    申请日: 1921-12-15
  • 公开(公告)号: US1455478A
    公开(公告)日: 1923-05-15
  • 发明人: LOCKHART COWEN WALTERALFRED FRIEND CLIVE
  • 申请人: LEOPOLD ROGALY
  • 专利权人: Leopold Rogaly
  • 当前专利权人: Leopold Rogaly
  • 优先权: US52269321 1921-12-15
Automatic starting and stopping attachment for disk-type talking machines
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