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  3  definitions  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  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. 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  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. 
  From  The  Free  On-line  Dictionary  of  Computing  (13  Mar  01)  [foldoc]: 
    A  device  that  combines  the  data  streams  from 
  many  simultaneously  active  inputs  into  one  shared  channel  in 
  such  a  way  that  the  streams  can  be  separated  after 
  transmission.  The  concentrator's  output  bandwidth  must  be  at 
  least  as  great  as  the  total  bandwidth  of  all  simultaneously 
  active  inputs.  A  concentrator  is  one  kind  of  {multiplexing} 
  For  example,  a  concentrator  may  be  used  to  connect  24  2400  bps 
  TTYs  to  a  host  via  a  57600  bps  channel.