I've researched to level 9.
On 8th level I was able to produce leather chair, but couldn't research them (quality research) - no leather chair in list when choosing an item in research list.
Can't do research
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Not each research facility can research every product.
A research facility of upgrade level 0 (the level to begin with) can only research the quality of goods that are research level 0.more here: Quality_research
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thnx, totaly forgot about that