Surprisingly, for a widely-deployed piece of safety equipment, some research has suggested that no lives are known to have been saved by use of an emergency oxygen mask - nor any lives lost through the absence of one - whilst carrying oxygen generating apparatus, albeit as cargo, has caused at least one fatal accident.
http://en.wikipedia.org/wiki/Emergency_oxygen_system#Usage_history
The reliability is fantastically fetched because of its environmentally safe layout which avoids micro organism from constructing up and going on over time with usage although it is wiped clean. The check valve and the filter out have to be replaced with a brand new one in each 6 months hole. The cartridge filter includes a spare filter in conjunction with a spare take a look at valve as properly. try so clean
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