I suspect the only USA brand is Palmgren and it would not surprise me if their current units are Chinese made. The only way to get an original US manuf. is to watch eBay and the used machinery sites. They were never that common, so finding a used one is a long shot. Yuasa( Japan) made pretty nice ones if you can find one. Their current catalog doesn't show them. Hopefully you aren't contemplating milling metal on your drill press. It does not work. You might get away with milling wood and plastic. Good luck.

RAN