The First Ever Noise-Cancelling Headphones
A vintage black-and-white photograph shows a close-up of a bulky, dome-shaped helmet with two circular eye holes and a central tube inserted into a mouthpiece. The original caption below the image reads: 'The above photograph shows a close-up view of the Isolator helmet. The oxygen supply enters the helmet via the tube shown.'
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2025-03-03 20:04:36
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