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2. High altitude breathing apparatus - Wikipedia

   en.wikipedia.org/wiki/High_altitude_breathing...

   The oxygen source may be chemical oxygen generators, high pressure portable gaseous oxygen storage systems (gas cylinders), on-board oxygen generating systems (oxygen concentrators), or liquid oxygen systems. [4] Chemical oxygen generation is commonly used on large commercial aircraft as a source for the emergency oxygen system for passengers ...

3. Portable oxygen concentrator - Wikipedia

   en.wikipedia.org/wiki/Portable_oxygen_concentrator

   Portable oxygen concentrator used with bottle humidifier POCs operate on the same principle as a home concentrator, pressure swing adsorption . [ 6 ] The basic set up of a POC is a miniaturized air compressor , a cylinder filled containing the sieve, a pressure equalizing reservoir and valves and tubes.

4. Oxygen concentrator - Wikipedia

   en.wikipedia.org/wiki/Oxygen_concentrator

   Oxygen concentrators are used widely for oxygen provision in healthcare applications, especially where liquid or pressurized oxygen is too dangerous or inconvenient, such as in homes or portable clinics, and can also provide an economical source of oxygen in industrial processes, where they are also known as oxygen gas generators or oxygen ...

5. News, Politics, Sports, Mail & Latest Headlines - AOL.com

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   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.

6. National Trails System - Wikipedia

   en.wikipedia.org/wiki/National_Trails_System

   Map of the system with trail logos Each national scenic and historic trail has a rounded triangle logo used to mark its route and significant points. [1]The National Trails System is a series of trails in the United States designated "to promote the preservation of, public access to, travel within, and enjoyment and appreciation of the open-air, outdoor areas and historic resources of the ...

7. Breathing apparatus - Wikipedia

   en.wikipedia.org/wiki/Breathing_apparatus

   The emergency oxygen supplied to passengers in commercial airliners that have lost cabin pressure is also a basic form of built-in breathing system, where the oxygen is generated and supplied as a constant flow for a limited period, which should be sufficient to allow the aircraft to safely descend to an altitude where the ambient air oxygen ...