Probably because we had Soviet bloc manufacturers of printers, Mera-Błonie in Poland, Robotron in East Germany, etc.

Im guessing Polish delegates were representing Pewex, or Baltona. Those were the only two institutions allowed to openly sell goods imported from the west. You could buy anything you wanted, including cars :o, the catch was you had to pay in western currency or fake dollars called "Bon towarowy". Their only purpose was to extract foreign currency from black market.