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When discharging industrial gas into the indoor environment in high altitude astronomy, we never wore breathing respirators that fed us oxygenated air at above the legally required 19.5% oxygen levels.
Steven Magee
air
altitude
astrobiology
astronomer
astronomical
astronomy
astrophysics
astrosociobiology
breathing
discharging
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high
indoor
industrial
legally
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liquid
osha
oxygen
oxygenated
respirators
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