There are still a few companies that make them. Called "slide charts", since they come in many forms besides just the "rule" form. I look into having them made

There are still a few companies that make them. Called "slide charts", since they come in many forms besides just the "rule" form. I look into having them made every now and then, but it seems like the minimum order quantity is almost universally 500. It would be nice if there was a modern style of e-print service for smaller quantities.