bright

busy

carriages

conditions

construction

craftsperson

dark

electrodes

engineering

equipment

eyewear

fabricator

factory

flame

hard

heat

helmet

hot

industry

iron

light

locomotives

manual

manufacturing

mashinist

mask

mechanical

melt

merge

metal

metalwork

occupation

production

protection

protective

roof

safety

sparks

steel

structures

tank

torch

train

valve

welder

welding

work

worker

workwear