19For the purposes of subsections (2) to (4) of section sixteen, the fact that, to a person's knowledge, the making of an article constituted an infringement of copyright under the Act of 1911, or would have constituted such an infringement if the article had been made in the place into which it is imported, shall have the like effect as if, to that person's knowledge, the making of the article had constituted an infringement of copyright under this Act.