機器
appliance
belt
black
construction
control
danger
defect
dirt
electricity
engine
environment
equipment
factory
gear
industrial
industry
instrument
iron
manufacturing
metal
oil
outdoors
pipe
pipeline
piping
plant
processing
production
quality
radiation
radiography
repair
sign
steel
technology
test
trade
trench
tube
weld
welding
worker
xray
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