Mr Welch didn't invent grape juice, he only found a way to preserve it. People have been enjoying raw juice from freshly squeezed grapes (albeit for only a short time) long before Welch or Pastuer came into the world.
No.
Grapes only existed for a brief period of time. Grapes would have only been eaten by the rich, such as emperors and kings. They did not have anyone make them grape juice.
No one would take the time and trouble to import grapes just so they could squeeze it and make a juice.
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