What are the exoskeletons in Heart x Hybrid (Masou Gakuen) called?

I tried looking on the net and on the wikia for this anime and I don't find much about them.

I'm talking about the exoskeletons that are in the background from time to time, not the Hybrid Gears.

You can see it in the background: You can see it in the background

You can see them clearly here: more exoskeletons

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