Most of them in my experience. Many industrial machines have lifespans well beyond 15years. Big companies buy the state of the art and when they decide to replace the old machines they resell them to smaller companies who can't afford to buy the newest model.

I know many people on HN work in web technologies where last year's technology is already obsolete but I've worked in small hardware companies that still used industrial equipment controlled using a serial keyboard with a DIN connector and a monochrome CRT. I've seen people order parts for 20+yo industrial soldering ovens.

You can't really tell somebody with a highly expensive, perfectly functioning industrial machine that they have to buy a new one because you can't find the driver for the motherboard of the controller.