The osteophonic helmet marked the first step for this remarkable technology breakthrough, when French manufacturing company ELNO began testing the ability to amplify sound waves between soldiers, minimising the need to speak loudly. Soldiers activated the system simply pushing a button on their rifle and when they move their vocal cords, the waves are captured and sent to the other helmets. Then, the inner ears of the receiver interpret vibrations as perfectly audible words, even dozens of metres apart, they can communicate via discreet whispers.

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