action
against
blue
busy
close
collar
construction
control
energy
equipment
factory
flow
gas
glasses
hard
heat
indoor
industrial
industry
machinist
maintenance
male
man
manual
manufafturing
one
open
person
pipe
pipeline
plant
power
pressure
production
pump
red
service
stand
station
stop
supply
support
tank
tube
turn
twisting
valve
vent
work
worker