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2. Rebar spacer - Wikipedia

   en.wikipedia.org/wiki/Rebar_spacer

   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. The rebar spacers are fixed before the concrete is poured ...

3. Bulkhead (partition) - Wikipedia

   en.wikipedia.org/wiki/Bulkhead_(partition)

   Most passenger vehicles and some freight vehicles will have a bulkhead which separates the engine compartment from the passenger compartment or cab; [11] the automotive use is analogous to the nautical term in that the bulkhead is an internal wall which separates different parts of the vehicle. Some passenger vehicles (particularly sedan/saloon ...

4. Orthodontic spacer - Wikipedia

   en.wikipedia.org/wiki/Orthodontic_spacer

   Orthodontic spacer removal. [2] Spacers are usually used to put spaces in between teeth before braces are established. It can be agitating or painful, but patients are often warned not to pick at them or they will fall out. They are usually rubber, but sometimes they can be metal. They can be used when a patient's teeth are too close together.