rebreather

(redirected from Semi-closed circuit)
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rebreather

1 a breathing apparatus that allows the breathing of a combination of supplied oxygen and exhaled or room air.
2 a reservoir mask that allows room air to flow in through ports so that it is mixed with supplied oxygen.
References in periodicals archive ?
Navy Frogman BM1 Louis Kucnski (right) wears an MK V Semi-Closed Circuit Underwater Breathing Apparatus.