air
background
bright
cfc
chemical
closeup
container
danger
decoration
design
detail
electricity
emergency
equipment
extinguisher
fire
flame
gauge
green
hand
handle
icon
indicator
industrial
industry
isolated
light
manometer
metal
new
nobody
non
object
old
paper
power
pressure
protection
pump
red
safety
science
security
sign
symbol
technology
tool
type
water
white