self-contained open-circuit breathing apparatus

scuba (Self-Contained Underwater Breathing Apparatus)

self-contained breathing apparatus (SCBA)

open burning and open detonation (OBOD) (= open-pit)

hose breathing apparatus

fresh-air hose breathing apparatus

oxygen-breathing apparatus

autonomous breathing apparatus

self-contained hydraulic system

self-contained unit

self-contained weapon

self-contained airstairs

self-contained propellant

self-contained navigation system

self-contained automatic navigation system

self-contained guidance system

self-contained mobility

self-contained movement

self-contained nuclear task group

self-contained

self-contained crew capsule

circuit breaker / circuit-breaker

open-circuit wind tunnel

open country / open ground

logistically self-sufficient (self-supporting)

air-breathing jet engine

breathing control

engine breathing ability

hose breathing device

CABCDE (Critical Bleeding, Airway, Breathing, Circulation, Disability, Exposure)

terrain-hugging air-breathing low-flying vehicles

air breathing engine

breathing system