Old computer punch card without holes.

Caption: This is a punch card such as was used to enter Fortran programs into the mainframe system at the University of Missouri–Rolla in the late 1970s. The beveled corner on the upper left ensured that all cards were oriented the same way.

Source

I was showing my old college calculus book to my son and found several of these in the pages – we would take stacks of them from the keypunch room to use as note cards and bookmarks. I scanned the picture and claim no rights to it. Kbh3rd

Scanned and uploaded to en: by Kbh3rd.

This object is not a creative work and therefore not subject to copyright.

من، دارنده حق تکثیر این اثر، این اثر را به مالکیت عمومی منتشر می‌کنم. این قابل اجرا در تمام نقاط جهان است. در برخی از کشورها ممکن است به صورت قانونی این امکان‌پذیر نباشد؛ اگر چنین است: من اجازهٔ استفاده از این اثر را برای هر مقصودی، بدون هیچ‌گونه شرایطی می‌دهم، تا وقتی که این شرایط توسط قانون مستلزم نشده باشد.