They're membrane keyboards, designed for special applications: industrial, POS/cashier, educational, accessibility.
A search at the
FCCID/OET site with the FCCID clearly shown in one of the photos ("JQE SKB") leads to Unicorn Engineering, now extinct, but these (educational) IntelliTools keyboards are shown
here. The bewildering variety of adapters and such allow them to be used on circa-1980 computers like Apple ][x, XT/AT, C64, and clones galore.
[Edit]
Assuming they still work, you could probably use them on a modern PC. You might need PS/2 and USB adapters, since I wouldn't be confident the supplied adapters would work.
I doubt it'd be worth the effort. Membrane keyboards are hugely resistant to the sticky fingers and spilled drinks of small children, but they generally don't age very gracefully; as the years pass, the (rubberized) plastics tend to get brittle and the contact points erode away. Besides, these ones look kinda cheap ... I wouldn't even want to use them in their intended (educational) role these days, since even cheap used keyboards would probably be "better" suited for today's children than these ancient oddballs. They won't contain any useful salvage beyond the obsolete adapters.
