A method for producing folds membranes, in particular for speech direction changes machines and electrical loudspeaker

• 1. 一种双层预折叠成型卷膜及其生产方法 [P] . 中国专利： CN101863341A . 2010-10-20
• 2. 一种用于柔性折叠屏幕的CPI硬化膜及其制备方法 [P] . 中国专利： CN113109897A . 2021-07-13
• 3. A method for the production of large surfaces membranes for sound reproducing devices, speech direction changes machines, electrical loudspeaker and the like. [P] . 德国专利： DE547840C . 1932-04-07

  机译： 一种用于大表面膜的制造方法，所述大表面膜用于声音再现装置，语音转向机器，电扬声器等。

• 4. Sound reproducing device, sound box for speech direction changes machines, electrical loudspeaker or the like. [P] . 德国专利： DE557850C . 1932-09-01

  机译： 声音再现装置，用于语音方向改变机器的音箱，电子扬声器等。

• 5. Sound amplifier for sound reproducing devices, speech direction changes machines, electrical loudspeaker or the like. [P] . 德国专利： DE502472C . 1930-07-16

  机译： 用于声音再现设备，语音转向机器，电扬声器等的声音放大器。

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