Haven't used a fax machine in over 5 years. It's stuffed somewhere in storage . . . . I think. Anything requiring a signature goes into Acrobat and gets a digital signature.
First fax machine I saw was in the mid-70s, called a "Quip" or something like that, made or sold by Exxon, I think. I did freelance art and layout for a banking magazine and the editor had one. I think it operated like a small drum scanner. Not sure it worked that well.