2 The Foreign Exchange Control Board may, when deemed necessary for purchase and sale and incidentarl transactions thereto of foreign exchanges, etc., received deposits of the foreign exchanges, etc. from the foreign exchange banks, etc., or may borrow (inclusive of cases pursuant to the conclusion of the contract of overdraft) the foreign exchanges, etc. from the foreign exchange banks, etc., of the burden of this Account, or may accept the foreign bill of exchange or may undertake the guarantee for the liability of the foreign exchange banks, etc. in connection with the foreign exchanges, etc., or may receive deposits of the cash from the foreign exchange banks, etc. or may borrow it under the contract of overdraft, on the burden of this Account.