How to judge the infringement after the patented technical features are produced by different manufacturers and then combined into patented products by consumers?

I think if A is the existing technology, Company A will at least not infringe your patent right; Although B is your innovative technology, because the patent protection is not the smallest unit, that is, B, but A+B, from the perspective of feature comparison, Company B does not infringe; The combination of consumer C, if it is for personal use, does not belong to infringement, if the sale is profitable, it is infringement.