Here you will find one or more explanations in English for the word Concentrators.
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Concentrator
Concentrator Con"cen*tra`tor, n. (Firearms)
A frame or ring of wire or hard paper fitting into the
cartridge case used in some shotguns, and holding the shot
together when discharged, to secure close shooting; also, a
device for slightly narrowing the bore at the muzzle for the
same purpose.
Concentrator
Concentrator Con"cen*tra`tor, n. (Mining)
An apparatus for the separation of dry comminuted ore, by
exposing it to intermittent puffs of air. --Knight.
Meaning of Concentrators from wikipedia