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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]] plug-in.  It is the first plug-in with transistors.  It was dropped after 1966 or 1967.


* [http://bama.edebris.com/manuals/tek/r/ Tektronix Type R Manual (BAMA)]
* [http://bama.edebris.com/manuals/tek/r/ Tektronix Type R Manual (BAMA)]

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