abstract
alloy
aluminum
backgrounds
built
cast
castings
color
colored
compartment
construction
equipment
facility
factory
foundry
gray
group
heavy
industrial
industry
iron
manufacturing
material
metal
metallic
mill
molded
molding
objects
part
pattern
rod
room
shape
shiny
silver
stack
steel
storage
structure
technology
tool
transportation
tube
vehicle
warehouse
white
work