Notwithstanding the provisions of Article L. 5122-11, the following may also engage in the activities defined in the first paragraph of that Article:
1° Persons who were engaged in such activities for at least three years in the ten years prior to 19 January 1994 ;
2° Persons other than those referred to in 1° who were engaged in these activities on 19 January 1994, provided that within four years of the same date they satisfy the conditions laid down in the first paragraph of article L. 5122-11 or the training conditions defined by the administrative authority.