sound recorders - and - again administration device for teaching purposes, in particular of a speech teaching purposes

• 1. 一种按键语音录音机用具有调节机构的录音机机芯 [P] . 中国专利： CN215376923U . 2021-12-31
• 2. 用于扩展窄带滤波的语音信号、特别是由通信设备发送的语音信号的带宽的方法 [P] . 中国专利： CN1529882A . 2004-09-15
• 3. sound recorders - and - again administration device for teaching purposes, in particular of a speech teaching purposes [P] . 德国专利： DE1807423A1 . 1970-06-04

  机译： 录音机，以及再次用于教学目的的管理设备，特别是语音教学目的

• 4. Magnetic tape device for teaching purposes, in particular of a speech teaching purposes. [P] . 德国专利： DE1911764U . 1965-03-11

  机译： 用于教学目的，特别是语音教学目的的磁带设备。

• 5. A method for producing a for teaching purposes, in particular of a speech teaching purposes, usable magnetic audio tape [P] . 德国专利： DE1232773B . 1967-01-19

  机译： 一种用于教学目的，特别是语音教学目的的可用磁带的生产方法

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