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221: Difference between revisions
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image=Tek 221 1.jpg | | image=Tek 221 1.jpg | | ||
caption=Tektronix 221 | | caption=Tektronix 221 | | ||
introduced= | introduced=1975 | | ||
discontinued= | discontinued=1991 | | ||
manuals= | manuals= | ||
* [http://w140.com/mmm/tek-221.pdf Tektronix 221 Manual (PDF)] | * [http://w140.com/mmm/tek-221.pdf Tektronix 221 Manual (PDF)] | ||