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A concrete spacer with a plastic clip in use Concrete spacers in a precast element Diaphragm wall block on rebar for a Diaphragm wall A rebar spacer is a short, rod-like device used to secure reinforcing steel bars, or rebar , within cast assemblies for reinforced concrete structures.
Thomas Edison is known as a pioneer of concrete development, and the first person to predict the use of concrete furniture. His company Edison Portland Cement Company combined ore milling technologies to develop more durable cement for construction of concrete houses and large building blocks. [ 2 ]
A caster (or castor) is an undriven wheel that is designed to be attached to the bottom of a larger object (the "vehicle") to enable that object to be moved. Casters are used in numerous applications, including shopping carts, office chairs, toy wagons, hospital beds, and material handling equipment. High capacity, heavy duty casters are used ...
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The earliest rail chairs, made of cast iron and introduced around 1800, were used to fix and support cast-iron rails at their ends; [2] they were also used to join adjacent rails. [ 35 ] In the 1830s rolled T-shaped (or single-flanged T parallel rail ) and I-shaped (or double-flanged T parallel or bullhead ) rails were introduced; both required ...
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