avoid patent infringement

How to avoid patent infringement, Whoever offers to sell or sells within the United States, or imports, a part of a protected machine, production, mix, or piece, or a material or device for use in rehearsing a licenced cycle, knowing something similar to be specially made or specially adjusted for use in an infringement of such patent, and not a staple article or item of trade reasonable for significant noninfringing use, will be obligated as a contributory infringer.