1991 video of the HCIL touchscreen toggle switches (University of Maryland)
Why the open web links it
Demonstrates early touchscreen toggle switch designs from 1991, showcasing pioneering HCI research on user interface safety and interaction.
Linked by 3 independent sites, 2 of them widely read in the 2026-10 crawl of the open web, including ycombinator.com, umd.edu, kit.com, codedocs.org.
Cited in 4 Wikipedia articles, including Touchscreen, Lock screen, University of Maryland Human–Computer Interaction Lab.