機器
bending
blade
business
construction
container
cut
cutting
electric
electrical
engineering
equipment
factory
grinder
grinding
hand
heavy
hydraulic
industrial
industry
iron
light
manufacture
manufacturing
mechanic
men at work
metal
oil
pipe
piping
power
pressure
production
protection
round
safety
spark
speed
steel
technical
technology
tool
welding
wheel
work
workshop