I'm not sure these even exist because I imagine Nintendo probably wanted to account for all of these and destroyed all of them, except for a select few for historical and potential use, but does anyone have a Gameboy cartridge Quality Assurance test bed?  I can't imagine that after Nintendo made any GB carts, that they'd ship them without first sticking them in a device and some tester would then verify that games boot, at least to the start screen.  Likely, 5-10 games were likely loaded and booted/tested at once.

Anyway, I'd like to find one of these device and see photos and or a video of the thing in action.

To be clear, I'm not asking about developer/tester equipment.  I mean, this is a device when carts are being manufactured and this would be the last step of manufacturing for a game, before moving on to packaging.