(b) Any course approved under chapter 33 of this title, prior to February 1, 1965, under subchapter VII of chapter
35 of this title, prior to March 3, 1966, and not disapproved under section 3483, section
1656 (as in effect prior to February 1, 1965), or section
3679 of this title, shall be deemed approved for the purposes of this chapter.