(a) Testimony given at a hearing shall be reported verbatim. The Administration will make provision for a stenographic record of the testimony and for such copies of the transcript thereof as it requires for its own purpose.

(b) At the close of the hearing, the presiding officer shall afford the parties and witnesses time (not longer than 30 days, except in unusual cases) in which to submit written proposed corrections of the transcript, pointing out errors that may have been made in transcribing the testimony. The presiding officer shall promptly thereafter order such corrections made as in his judgment are required to make the transcript conform to the testimony.