I have googled those for you: linternaute.com/restaurant/l... But I am sure there are a more restaurants with wheelchair access. If you search restaurants look for "accès handicapé".
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On the chance you have not previously been to Blois, I might add that the city itself is situated on the side of a rather steep hill. The real question may be "is Blois wheelchair accessible?" My opinion is that it may not be depending upon what you will be doing once you are there.
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