NASA NTRS · 19780009737
Helmet feedport
Abstract
A helmet design is described which encapsules the head of the wearer, is capable of being pressurized and provides a means for gaining internal access for the purpose of eating. A mechanically actuated valve that combines the purging of carbon dioxide and feeding operations by a simple movement of a mechanical lever obviates problems that are attendant in the type of feed and purge ports previously incorporated in pressurized helmets.
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Kothe, E.. 1967-12-26. Helmet feedport. https://ntrs.nasa.gov/citations/19780009737
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