The Free On-line Dictionary of Computing (30 December 2018):

Harvard Mark II Machine

    A relay-based computer designed and
   built by Howard Aiken, with support from IBM, for the
   United States Navy's Naval Proving Ground, between 1942 -
   1947.  The Harvard Mark II was the second in a series of four
   electro-mechanical computers that were forerunners of the
   ENIAC.

   Harvard machines

(http://hoc.co.umist.ac.uk/storylines/compdev/electromechanical/harvardmarkmachines.html).

   (2003-09-13)