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high-current regulated power supplies which feature germanium power transistors. | high-current regulated power supplies which feature germanium power transistors. | ||
Type R was introduced in 1958, along with the [[551]], [[533]], and [[543]] mainframes, | Type R was [[introduced in 1958]], along with the [[551]], [[533]], and [[543]] mainframes, | ||
and the Type [[H]] plugin. It is the first plugin with transistors. It was dropped after 1966 or 1967. | and the Type [[H]] plugin. It is the first plugin with transistors. It was dropped after 1966 or 1967. | ||