A camera is used to take pictures., A video camera is used to record videos., A radio is used to broadcast music and news., A speaker is used to amplify sound., A battery is used to store energy., A battery is also used to power devices., A telephone is used to connect people., A television is used to display images and entertain viewers., A computer is used to process data and store information., A telegraph is used to send messages and transmit signals.,

Inventions_Reorder

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