WATS Up?

I just clicked on an ad for Woodhill Supply that got my attention. It's great to see a small, regional business with a professional, well designed web site. They have their phone number and address prominently displayed on their home page, which is an excellent idea. However, it really cracks me up that they call their toll-free phone number an  "Ohio WATS" line on their home page. I wonder how many people even know what a WATS line is (or was).