scaffold	Steel elements that are used for workers to reach high levels in a building, such as ceilings, high walls
arc	It is a curved beam whose radius of curvature is very large in relation to the width of the section.
cement	a building material that is a powder made of a mixture of calcined limestone and clay; used with water and sand or gravel to make concrete and mortar
column	Vertical structural element, used to support slabs and raised elements,
aluminum	a silvery ductile metallic element
cable	very strong thick rope made of twisted hemp or steel wire
cast iron	an alloy of iron containing so much carbon that it is brittle and so cannot be wrought but must be shaped by casting
compressor	a mechanical device that compresses gasses
concrete	a strong hard building material made with gravel and cement
crank	a hand tool consisting of a rotating shaft with parallel handle
filter	device that removes something from what passes through it
iron	a heavy ductile magnetic metallic element
wrought iron	iron having a low carbon content that is tough and malleable and so can be forged and welded
valve	a mechanical device for controlling the flow of a fluid
truss	a rigid framework of beams that supports a structure

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