>>>Also, in Hollerith code the letters J-R use the 11 punch.
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>Had to look that up, as it predates what I had believed to be elder computer memories. I caught the very end of the card punch era when the Uni Computer Society purchased a mainframe for all cash on hand = $26 and a six-pack of beer. So charmed were the industrial sellers to declare this the winning bid, that they spent a fortune delivering it to the Human Sciences building that was being fitted out at the time, creating a downstream furor when it was discovered that it couldn't be gotten out again without dismantling interior walls. Those were the days. This one had the latest multi-platter Winchester drive that sounded like a flying saucer when it spooled up before activating the circuit breakers, plunging lecture theaters into darkness. Yes, my enjoyment of chaos certainly was well-served by that wonderful machine. ;-)

Back in 1988 the construction enterprise's ERC (electronic computational centre, aka IT department) bought a brand new punch card reader. Right after my then employer sold them a PDP (desktop sized, just about a larger TV with a VT100 terminal on top) plus three terminals. They may have had a timeshare in the communal IBM360 which was a block away.

Three years later a different lady was the boss there, and I was working for a different outfit, and they were our customer for a set of mFoxPlus apps. I went there several times and I don't remember seeing that card reader much, perhaps only as something covered with a drape, sitting somewhere in the corner. The VAX which I managed on the previous job was then sold at a price lower than the huge AC it had to have.