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.

• 487 - Sears, William J, A Historical Review of Partial and Full Pressure Suits, . HTML when accessed: http://webpages.charter.net/mcelwain/PSUITS-Chronology.htm