If any provision of this Part or of Parts 361, 362, 363, 364, 365, 366, 369, or Subpart 374-2 of this Title or the application of any provision of any of these Parts to any person or circumstance is held invalid, the remainder of this Part and of Parts 361, 362, 363, 364, 365, 366, 369, and Subpart 374-2 of this Title, and the application of those provisions to persons or circumstances other than those to which it is held invalid, shall not be affected thereby.