機器
assembly
battery
black
business
construction
control
ecology
electricity
energy
engineer
engineering
factory
fastener
fitting
gas
gear
icon
illustration
industrial
industry
investigation
manufacture
mechanic
metallurgy
nuclear
oil
pipe
plant
power
process
pump
refinery
robot
safety
set
sign
solar
symbol
system
technology
tool
transportation
truck
unit
wind
worktool