Collins would tell everyone when to switch on their oxygen systems.

The poison in the water must be getting through into our oxygen systems!

The oxygen systems in your helmets provide plenty of air for a short journey!

At 8326 m Bruce had a problem with the oxygen system.

My guess is a malfunction in the oxygen system, but we may never know.

There was not a single gripe on the oxygen system.

An oxygen system should also be protected from external heat sources.

Results are used in design and operation of safe oxygen systems.

Diluter-demand oxygen systems can be used up to 40,000 feet.

A standard instrument fit and an oxygen system were provided by the manufacturer.