Anything freestanding and over 50 years old. IMHO. A nice Unisaw, shapers, jointers, drill presses, grinders from Baldor and Dayton, a 12" disk sander with 6" belt sander. I have a classic DeWalt radial arm saw but they are dangerous so I'm not sure I recommend them when sliding compound miter saws are available. You need a good compressor; Kellog American, and Ingersol Rand are very high quality two stage machines and expensive. Even when used. I have a Dayton 9 cfm at 125PSI machine that I bought new from Granger 25 years ago and it's still going strong. A Kellog American you will pass through your children to your great grandchildren.
I don't by any powered hand tool used. Perhaps with the exception of an older Skilsaw they are just not worth the effort to maintain.
Get a set of wheel and bearing pullers and repair the stuff. It will last forever. Three phase to single phase conversion can be done once at the panel or at each machine. Or you can replace motors at considerable cost.