architecture
assembly
balance
beam
building
concrete
construction
craftsman
crane
danger
dangerous
development
elevator
engineering
frame
girders
height
helmet
high
human
industrial
industry
installing
job
labor
laborer
lifting
machinery
man
manual
operator
people
pillar
placing
project
protective
rigger
safety
site
skeleton
sky
structure
truss
unsafe
vest
worker
working
workman