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For infringing a claim, all elements of a claim need to be infringed. A claim a + b can either be “at least and b“ (typically) or “exactly a and b“ (for example exactly 40% sparkling water and 60% apple juice, very rare). In your example, at least claim 1 must be “at least a and b“ because else a+b+c would not be a dependent claim as dependent claims are ...

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