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The Dräger BG4 closed-circuit
breathing apparatus, here with Dräger Gallet helmet and Yellow
Draeger full face mask, is equipped with an electronic testing,
warning and display module (see blue item at right picture) which
informs the user of the device status and provides the necessary
warning messages. The prinzip of this system is the same as for
scuba diving, called here Rebreather.
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