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Thread: Tone generator - GIF

  1. Jun 19, 2021, 08:13 PM #1
    Altair
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    Tone generator - GIF

    German tone generator from 1967.




    Previously:

    Maintaining telephone switches in the 1930s - photo
    1920s telephone lineman - photo
    Barbed wire telephone lines - photos

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  3. Jun 22, 2021, 08:05 AM #2
    nova_robotics
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