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plugins would use A-J and fast ones L-Z. This idea never went anywhere. | plugins would use A-J and fast ones L-Z. This idea never went anywhere. | ||
Type 53K/54K was 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. | ||
At that time, it was the only plugin that could utilize the | At that time, it was the only plugin that could utilize the | ||
new mainframes' speed; the redesigned Types [[A]], [[B]], and [[C]] | new mainframes' speed; the redesigned Types [[A]], [[B]], and [[C]] |