(a) the bonds, together with interest thereon, interest on any unpaid installments of interest and all costs and expenses in connection with any action or proceeding by or on behalf of the bondholders are fully met and discharged or
(b) principal or interest of any of the bonds shall be overdue and unpaid for a period of three years or more. * NB Dissolved December 1977 * NB There are 2 § 1555's