機器
angle
construction
craftsman
cutter
cutting
electric
electrical
engineering
equipment
erecting
factory
fire
fitter
flash
gloves
grinder
heavy
industrial
industry
iron
job
labor
laborer
light
making
man
manufacture
manufacturing
mechanical
metal
people
person
pipe
power
production
protection
safety
skill
spark
sparks
steel
technical
tool
welder
welding
work
worker
workshop