architecture
assembly
build
building
clamp
close
component
connected
connector
construct
construction
development
device
engineering
equipment
fasten
frame
framework
grey
grip
hold
icon
industrial
industry
iron
isolated
joined
link
metal
part
pipe
platform
safety
scaffold
scaffolding
screw
security
sign
site
stage
steel
strength
strong
structure
support
symbol
tool
tube
up
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