§ 348. Superintendent authorized to examine. For the purpose of discovering violations of this article or securing information lawfully required hereunder, the superintendent may at any time, and as often as may be determined, either personally or by a person duly designated by the superintendent, investigate the loans and business and examine the books, accounts, records, and files used therein of every licensee. For that purpose the superintendent and duly designated representatives shall have free access to the offices and place of business, books, accounts, papers, records, files, safes and vaults of all such licensees. The superintendent shall have authority to require the attendance of and to examine under oath all persons whomsoever whose testimony may be required relative to such loans or such business.