3d
alert
art
attention
background
barrel
beware
caution
color
colorful
contour
danger
design
energy
engineering
equipment
error
exclamation
flat
fuel
gas
gasoline
gradient
icon
illustration
industrial
industry
isolated
isometric
line
linear
lineart
mark
oil
outline
petroleum
pipe
pipeline
power
pressure
risk
safety
sign
symbol
technology
triangle
tube
valve
water
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