機器
black
boom
builders
building
cement
civil
concrete
construction
constructors
crane
development
engineer
engineering
equipment
frame
heavy
high
icon
industrial
industry
isolated
labor
labour
lift
lorry
machinery
making
man
mixer
operation
people
person
pictogram
plant
scaffolding
sign
silhouette
site
sky
steel
stick figure
symbol
tall
tools
tower
truck
vehicle
worker
working