abstract
authority
black
blue
boom
building
cable
cabling
cloud
cloudy
construction
cord
cordage
crane
electric
electrician
electricity
engineering
equipment
form
heavy
high
hook
human
industrial
industry
lead
lifting
line
lines
maintenance
man
metal
mobile
post
power
repair
rig
service
serviceman
shadow
shape
sky
supply
technician
transport
transportation
vehicle
voltage
white
wire
yellow