Canadian pressure suit, operational 1957. The Canadian Waistcoat-Mask/Vest/G-Suit was a partial pressure assembly. The Canadians studied variants of this assembly as far back as the early 1940's.
Newer variants were studied for short term protection to altitudes of 24 km with the G suit pressurized to 4 times breathing pressure.
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Space Suits To explore and work in space, human beings must take their environment with them because there is no atmospheric pressure and no oxygen to sustain life. Inside the spacecraft, the atmosphere can be controlled so that special clothing is not needed. But in order to work outside the spacecraft, humans need the protection of a spacesuit. More...
Sears, William J, A Historical Review of Partial and Full Pressure Suits, Web Address when accessed: here.
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