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How big is the US patent market in Virtual Reality patents?

I'm trying to work out how many virtual reality patents are assigned each year, and how the size of the market has changed. I also want to work out how many patents are reassigned each year, and how ...
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Why are the assignors of a patent not necessarily identical with previous assignees?

When I researched the assignment history of a patent I found one assignment (from assignor A to assignee B) and a later assignment (from assignor B and C to assignee D). Where does C come from?