Did DEC actually sell that many? In my years of working around DEC gear starting in the late 1960s, I think I saw a card read/punch only once on a PDP-6 IIRC, but it might have been a KA10. I don't think I ever saw one on a PDP-8/11 or Vaxen.
I used cards primarily with IBM, Univac, and CDC gear, but did use a mark-sense reader with a PDP-8. Edusystem-30. Same size as punch cards but 40 mark-sense columns.
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