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Old style cup phone with red string at the center, concept for two way communication, information transmission, sender and receiver, communicate with each other Photos | Adobe Stock
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How to make a String Phone using Paper Cup| Science behind String phone| Make Your Own String Phone - YouTube
Old style cup phone with red string on white background, two way communication, information transmission, sender and receiver, communicate with each other Photos | Adobe Stock
tin-cups-on-string - Eric Chester
Two Paper Cups and a String | Sound | Physics Demos | Physics | College of Science and Engineering | Seattle University