caution
construction
craftsman
electricity
electroarch
electrode
energy
engineering
equipment
exterior
factory
fire
flame
gas
grime
hazardous
industrial
industry
inside
iron
job
laborer
laboring
light
manufacturing
mask
metal
oil
overalls
pipe
pipeline
pollution
production
protection
protective
safe
site
skill
skilled
south stream
spark
sparks
steel
technology
tool
tube
welder
welding
wires
work