What kind of "what" would I have to write to say "What produces this machine?"?
How do I know if it's that, or "What does this machine produce?"?
In the latter case, maszyna would take the accusative (maszynę). So it would be "Co produkuje tę maszynę?"
millions of examples of "makes" as opposed to the few examples using "produce"
I'm not sure what point you're making about this sentence. I assume you accept that produce is the correct translation of produkuje. Did Duo reject your use of the word make? If so, use the report button.