Nothing in this article shall change or diminish practice rights of those licensed as osteopaths under Chapter 19 of Title 56 of Code of Laws of South Carolina, 1962. All persons holding a valid certificate of this State to practice osteopathy under Chapter 19 of Title 56 of Code of Laws of South Carolina, 1962 and who are actively engaged in such practice in this State on July 14, 1969 shall be issued a license to practice osteopathy as defined under this article.