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Are you trying to sell a base, Evo, or Final unit? In theory, you can fuse them once you have 3 copies, and you can sell them once you have more than 1—unless it's a "Final" type. 

 Thanks for the comment!

Thanks for the feedback! 

My idea is for the subsequent machines (unlocked halfway through the first album's generation) to provide upgrades for the previous ones and create a feedback loop. In any case, I'll keep your comment in mind when reviewing it.

 Thanks!!