Could it be to “join” several layers of something together? Or the dents could be filled with jam...or ravioli filling. To me, the ceramic counter top indicates food prep. The rollers are heavy-duty, maybe for large slabs of meat.
It looks like a huge, complicated and clumsy tool for making ravioli...
Well, something is moving along through the two rollers and producing dents as you said....and I agree...it’s probably a food product. Hmmmmm