https://www.siliconvalley.com/2019/10/04/magid-microsoft-hardware-future-may-hinge-on-hinges/ > The website Thomasnet.com says that “Hinges have been found in ancient societies in Africa, Asia, Europe and elsewhere,” dating back 5,500 years. > Historically, they were used to open doors, but as Harry McCracken wrote in a 2012 Technologizer post, in April, 1982, Grid Systems announced a portable computer “with a screen on one half of the interior, a keyboard on the other and a hinge in the middle. It was, in other words, the first computer with a clamshell case–or, to use a more common term, the first laptop.”