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Why did the Mercury astronauts have hoses connected to their helmet while inside their spacecraft? I haven't seen that with any other astronauts or cosmonauts. - Quora
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The Evolution of the Spacesuit: From the Project Mercury Suit to the Aouda.X Human-Machine Interface - Interesting Engineering
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Were the Mercury capsules the only manned spacecraft to have seats that were custom fitted to each astronaut? - Quora
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What was the round, convex mirror-like object attached to the chest of the Mercury astronauts and what was it used for? - Quora
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Project Mercury - Wikipedia
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