Harry Truman actually said...
Existing regulations governing the subject matters of this order, including such regulations prescribed by Executive order, shall, subject to the termination of such Executive order by its own terms, remain in effect until modified, revoked, or superseded by action taken pursuant to this order.
Context
Executive Order 10049—Delegating the Authority of the President to Prescribe Clothing Allowances, and Cash Allowances in...
04/01/1949