I've often heard that Gutenberg's contribution to the printing press was the development of movable type. As opposed to unique fixed blocks of text, Gutenberg used letters which could be rearranged for each page. I'm posting this on the Talk page since I don't know for sure that this is correct.
To my knowledge, your understanding is correct.
I think it is alluded to in this article by the statement:
- Gutenberg refined the technique by inventing an oil-based ink and [metal type],
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