air breathing engine

air-breathing jet engine

compressorless air-breathing jet engine

ram air-breathing jet engine

engine breathing ability

terrain-hugging air-breathing low-flying vehicles

fresh-air hose breathing apparatus

engine capacity / engine power, engine output

breathing control

scuba (Self-Contained Underwater Breathing Apparatus)

self-contained breathing apparatus (SCBA)

hose breathing apparatus

hose breathing device

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

breathing system

oxygen-breathing apparatus

autonomous breathing apparatus

breathing oxygen

breathing-oxygen system

self-contained open-circuit breathing apparatus

reaction engine / motor (jet engine)

rotary engine (Wankel engine)

engine ground run / engine test

engine oil reservoir / engine oil tank

air support field pack, field pack air support, airborne / para (air support) / pathfinder Bergen

air combat capable helicopter / air-to-air capable helicopter

engine air intake tube

air engine

air-stream engine

waterproof air-cooled engine

diesel engine with air cell

Vee-form air-cooled engine

air-feed jet engine