機器
black
business
coal
coal mine
coal miner
construction
crane
employee
energy
engineer
engineering
equipment
excavator
factory
fuel
geological
glyph
hardhat
helmet
icon
illustration
industrial
industry
inspector
machinery
man
manager
mechanic
mine
miner
mineral
mining
modeling
monochrome
occupation
professional
project
quarry
safety
sign
site
symbol
technology
truck
uniform
work
worker
yellow