Customers' Free Credit Balances

No broker or dealer shall use any funds arising out of any free credit balance carried for the account of any customer in connection with the operation of the business of such broker or dealer unless such broker or dealer has established adequate procedures pursuant to which each customer for whom a free credit balance is carried will be given or sent, together with or as a part of the customer's statement of account, whenever sent but not less frequently than once every three months, a written statement informing such customer of the amount due to the customer by such broker or dealer on the date of such statement, and containing a written notice that (a) such funds are not segregated and may be used in the operation of the business of such broker or dealer, and (b) such funds are payable on the demand of the customer: Provided, however, That this section shall not apply to a broker or dealer which is also a banking institution supervised and examined by State or Federal authority having supervision over banks. For the purpose of this section the term customer shall mean every person other than a broker or dealer.