pianino with built-in speech direction changes machine and a built-in radio reception device

• 1. 一种带有内置式单向阀的液压转向器 [P] . 中国专利： CN209795596U . 2019.12.17
• 2. 一种内置声波接收装置的网络摄像机及监控系统 [P] . 中国专利： CN208402001U . 2019.01.18
• 3. Vehicle antenna for a speech direction changes in a motor vehicle built-in radio device. [P] . 德国专利： DE1974664U . 1967-12-14

  机译： 用于语音方向的车辆天线在机动车辆内置无线电设备中改变。

• 4. Radio receiver speech direction changes with the reception ready shaft display connected to a movable, portable speech direction changes radio device [P] . 德国专利： DE29714812U1 . 1997-10-09

  机译： 无线电接收器的语音方向发生变化，并且接收就绪竖井显示器连接到可移动的便携式语音方向改变无线电设备

• 5. A portable, possible to change in a protective helmet built-in radio speech direction changes system [P] . 德国专利： DE1157662B . 1963-11-21

  机译： 便携式，可更换的防护头盔内置的无线电语音方向转换系统

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