Fax by Ciro Santilli 34 Updated +Created
Uses telephone lines, and therefore were still usable much much after the Internet made them obsolete, which is quite funny.
Video 1.
Teletype ASR 33 Part 10: ASR 33 demo by CuriousMarc (2020)
Source.
Video 2.
Fax Machine by Museum of Obsolte Objects (2011)
Source.