Cam if you reread the PO, I think you will find Happ has some Italian equipment on hand that he'd like to sell over here, be he needs some assistance finding the appropriate sort of converter to sell along with it so that it will work on our kinda voltages, etc
I'd suppose he'd also need adapters for all the plugs and sockets
You are correct in your last sentence.
When a company wants to install equipment of such magnitude, the company must hire the electrician or electric company for the installation, unless the seller is also the installer, something that for sure is not the case with this seller. The electrician must consult with the manual and if no information is given for use in systems with different voltage, then it is a must consulting with the manufacturer.
Three phase installation in Italy is 400v- 50hz
In the US is 220v, 240v, 277v, 480v-60Hz
Numbers of wires in Italy is four (4)while in the US could be three or four (3-4)wires, plus ground in both cases.
The seller must check with the manufacturer of the machine, and they will find the proper transformer and adapter to be used in the US. No other can provide that information with certainty, because the transformer must consider tolerances that if not taken in consideration can cause problems like overheating and similar. The manufacturer is in my opinion, the most adequate source of information in this case.
Examples of difference with 220v plugs.
USA receptacle (one of the models)
European plug and receptacle