Early means of communicating over a distance included visual signals, such as beacons, smoke signals, semaphore telegraphs, signal flags, and optical heliographs.
Early means of communicating over a distance included visual signals, such as beacons, smoke signals, semaphore telegraphs, signal flags, and optical heliographs.
user
Ранні засоби зв'язку на відстані включали візуальні сигнали, такі як маяки, димові сигнали, оптичний телеграф, сигнальні прапорці та світлосигнальні геліографи.
assistant