Section 171
SEC. 171. A general bond for the delivery of unexamined packages, covering a period not exceeding six months, in such form as t shall be prescribed by the Insular Collector, may be accepted in lieu of the special bond; the estimated liability and date of each subsequent importation shall be indorsed upon this bond, and the aggregate liability of such importations must not exceed the penalty named in the bond. Each such indorsement shall be canceled by the liquidation of the entry to which it relates.