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  1. Maruti Verma

    Mechanical Door Bell without electromagnet coil

    Thanx for your suggestion #3DDAVE. I am looking for some solution not this advice. And yes you can communicate over long distances via email and posts which we were doing in earlier times. But i appreciate your idea of time machine, will think upon this.
  2. Maruti Verma

    Mechanical Door Bell without electromagnet coil

    Is it a solution.???
  3. Maruti Verma

    Mechanical Door Bell without electromagnet coil

    I want to design a ding-dong door bell without electromagnet coil and don't want to use EMF for power source. I am looking for any mechanical alternative method to crack this. Pleaee support and give your suggestions/feedbacks.

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