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{{Oscilloscope Sidebar | | {{Oscilloscope Sidebar | | ||
title=Tektronix 561 | | title=Tektronix 561 | | ||
image=Tek | image=Tek 561b cal trace.jpg | | ||
summary="General Purpose Scope" | | summary="General Purpose Scope" | | ||
caption=Tektronix | caption=Tektronix 561B | | ||
introduced=1961 | | introduced=1961 | | ||
discontinued=1974 | | discontinued=1974 | |