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Type 53K/54K was [[introduced in 1955|introduced in March 1955]] along with the [[541]]/[[545]]. | Type 53K/54K was [[introduced in 1955|introduced in March 1955]] along with the [[541]]/[[545]]. | ||
It was designed by [[John Kobbe]]. | |||
At that time, it was the only plug-in that could utilize more than half of the new mainframes' speed; | At that time, it was the only plug-in that could utilize more than half of the new mainframes' speed; | ||
the [[A|Type A]], [[B|Type B]], and [[C|Type C]] upgrades weren't ready until August 1956. | the [[A|Type A]], [[B|Type B]], and [[C|Type C]] upgrades weren't ready until August 1956. | ||