What are these IBM 'thingys'

[William Donzelli]

> My father (NOT a computer historian) used to tell me that IBM patented the
> shape of the hole!  That resulted in a few short-lived attempts at
> round-hole cards, etc.),

More than a few, actually. There were many, including a trinary one
(Super Bee or something. Anyone help?) that used cards with
information only on the four edges of the card, but the choices were
hole, no-hole, or hole-with-no-outside-edge.

--
Will