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 for control unit
From The Free On-line Dictionary of Computing (30 December 2018) :

  control unit
     1.  The part of a CPU that sends control signals
     to other components to cause them to execute the machine
     cycle - fetch, decode, execute, store.
     2.  Any device that controls the I/O operations
     of one or more peripheral devices, e.g. a disk controller.

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