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{{title|Relay Computer}}
 
{{title|Relay Computer}}
[[File:Harvard Mark I.jpg|thumb|right|250px|The {{ibm|Harvard Mark I}}, a [[relay logic|relay-based]] computer, one of the earliest, made by [[Howard Aiken]] with the help of [[IBM]] in 1944.]]
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[[File:Harvard Mark I.jpg|thumb|right|250px|The {{ibm|Harvard Mark I}}, a [[relay logic|relay-based]] computer, one of the earliest, made by [[IBM]] in 1944.]]
 
A '''relay computer''' is a computer system built primarily using electromechanical [[relay]]s and [[relay logic]].  Obsoleting most of the earlier [[mechanical computer]]s, relay were a short-lived technology during the late 1930s to early 1950s. By the late 1950s technology has shifted almost exclusively to [[vacuum tube]]s. From the mid 1950s onward, [[vacuum tube computer]]s superseded relay logic.
 
A '''relay computer''' is a computer system built primarily using electromechanical [[relay]]s and [[relay logic]].  Obsoleting most of the earlier [[mechanical computer]]s, relay were a short-lived technology during the late 1930s to early 1950s. By the late 1950s technology has shifted almost exclusively to [[vacuum tube]]s. From the mid 1950s onward, [[vacuum tube computer]]s superseded relay logic.
  

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