Fax is vintage tech since at least a decade, but it was useful.
My first contact with them was not on a fax machine, but using a Sportster Winmodem/fax. Faxing was possible using a Windows 3.1 computer, using QuickLink II software.
Later on, I got this “marvelous” Panasonic KX-FT38 fax machine, with its markings in Spanish of course. A noble 300dpi device, with 20min digital recorder for voice and data (delayed thermal printing was possible). Also has an automatic cutting blade. 14.4 kilobauds of pure faxing power!
I used it daily. Somewhat people REPLIED to fax transmissions, as it served to speed response time on bureaucratic nonsense. Secretaries did their thing when they got a fax with their names handwritten on them. IDKW but it worked.