barrel
bolt
bonnet
built
business
chemistry
chimney
closeup
complex
construction
damper
ecology
energy
engineering
environment
equipment
etroleum
extraction
field
fuel
fuel oil
gas
industrial
industry
iron
knife
metal
nuts
oil
overlapping
pipe
pipeline
pipes
piping
pollutant
pollution
power
pressure
production
protection
refinery
seal
sluice
station
steel
tank
technology
valve
well
wheel
定額
Manual shut-off valve on oil well. Oil well wellhead equipmentの素材 [FY31091387703]
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