oxygen (2 photos)

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oxygen tank valve, dust mask, face-mask, gas tank, headlamp, headlight, high-visibility jacket, high-visibility vest, light rail, man, muni, night, ntk, oxy-acetylene, oxygen, pressure gauge, railroad construction, railroad tracks, railway tracks, reflective jacket, reflective vest, regulator, safety glasses, safety gloves, safety helmet, safety vest, san francisco municipal railway, track maintenance, track work, valve, welder, worker, working
oxygen tank valve
oxygen-victor - valves - abandoned hospital (presidio, san francisco) - phsh, abandoned building, abandoned hospital, close up, oxygen gas, presidio hospital, presidio landmark apartments, trespassing, valves
oxygen-victor, valves, abandoned hospital, presidio, san francisco