Telephone, an instrument designed for the simultaneous transmission and reception of the human voice This video is about: Telephone. Subscribe to our YouTube channel to watch more General Science lectures. Practice tests and free video lectures for Physics, Chemistry, Biology, Math’s, Computer Science, English & more subjects are also available at Sabaq.pk. So, subscribe to Sabaq.pk/Sabaq Foundation now and get high marks in your exams. About Us: Sabaq.pk or Sabaq Foundation is a non-profit trust providing free online video lectures for students from classes K - 14 for all education boards of Pakistan including FBISE, Sindh Board, KP Board, Baluchistan Board as well as for Cambridge. We have a team of qualified teachers working their best to create easy to understand videos for students providing 14,000 + free lectures for subjects including Physics, Chemistry, Mathematics, Biology, English, General Science, Computer Science, General Math, Statistics and Accounting. Sabaq.pk al

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