african
background
black
building
caucasian
coal
construction
dirty
electric
engineer
engineering
equipment
factory
gas
gloves
hardhat
hat
helmet
industrial
industry
job
labor
laborer
male
man
manual
men
metallurgical
mine
miner
miners
mining
occupation
oil
people
person
pipeline
plant
protection
protective
safety
smiling
technician
water
welder
welding
work
worker
workers
young