Notwithstanding any provision of these rules, any bylaw, rule, regulation, or resolution of a contract market that was submitted to the Secretary of Agriculture pursuant or § 1.38(a) or § 1.39(a) of these rules, and was either approved by the Secretary or not disapproved by him, as of April 21, 1975, shall continue in full force and effect unless and until disapproved, altered or supplemented by or with the approval of the Commission. The adoption of this rule does not constitute approval by the Commission of any contract market bylaw, rule, regulation or resolution.