air
barometer
boiler
characters
circulation
clock
compressor
control
counter
device
dial
display
easyfairs
element
engineer
factory
faucet
fuel
gasl
gauge
hours
hydraulic
icon
illustration
industrial
industry
instrument
manometer
measure
measurement
metal
monitor
needle
oil
opening
petroleum
pipeline
power
pressure
pump
sex
system
technology
temperature
tool
tube
two
valve
watches
water