The independent claim declares „comprising … at least one support.“
The dependent claim state „a body joined to said support.“
Does the dependent claim cover a body that is joined to, say, four supports?
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Yes. It would even suffice to say "comprising a support, the body joined to the support."
It means the device has a support which is connected to the body. One with 4 supports still has 1 support that is connected to the body -> 4 times.
Also, if the description doesn't hint otherwise, the interpretation that a support may have 4 pieces could be possible. (In this case, "at least one" could be a hint otherwise.)