(i) (A) any mortgage, pledge or other lien or encumbrance on any such property hereafter acquired or constructed by the Issuer or a Subsidiary, or on which property so constructed is located, and created prior to, contemporaneously with or within 360 days after, such acquisition or construction or the commencement of commercial operation of such property to secure or provide for the payment of any part of the purchase or construction price of such property, or (B) the acquisition by the Issuer or a Subsidiary of such property subject to any mortgage, pledge, or other lien or encumbrance upon such property existing at the time of acquisition thereof, whether or not assumed by the Issuer or such Subsidiary, or (C) any mortgage, pledge, or other lien or encumbrance existing on the property, shares of stock or indebtedness of a corporation at the time such corporation shall become a Subsidiary, or (D) any conditional sales agreement or other title retention agreement with respect to any property hereafter acquired or constructed; provided that, in the case of subclauses (A) through (D) of this clause (i), the lien of any such mortgage, pledge or other lien does not spread to property owned prior to such acquisition or construction or to other property thereafter acquired or constructed other than additions to such acquired or constructed property and other than property on which property so constructed is located; and provided, further, that if a firm commitment from a bank, insurance company or other lender or investor (not including the Issuer, a Subsidiary or an Affiliate of the Issuer) for the financing of the acquisition or construction of property is made prior to, contemporaneously with or within the 360-day period hereinabove referred to, the applicable mortgage, pledge, lien or encumbrance shall be deemed to be permitted by this clause (i) whether or not created or assumed within such period;
(ii) any mortgage, pledge or other lien or encumbrance created for the sole purpose of extending, renewing or refunding any mortgage, pledge, lien or encumbrance permitted by clause (i) of this subsection (a); provided, however, that the principal amount of indebtedness secured thereby shall not exceed the principal amount of indebtedness so secured at the time of such extension, renewal or refunding and that such extension, renewal or refunding mortgage, pledge, lien or encumbrance shall be limited to all or any part of the same property that secured the mortgage, pledge or other lien or encumbrance extended, renewed or refunded;
(iii) liens for taxes or assessments or governmental charges or levies not then due and delinquent or the validity of which is being contested in good faith, and against which an adequate reserve has been established; liens on any such property created in connection with pledges or deposits to secure public or statutory obligations or to secure performance in connection with bids or contracts; materialmen’s, mechanics’, carrier’s, workmen’s, repairmen’s or other like liens; or liens on any such property created in connection with deposits to obtain the release of such liens; liens on any such property created in connection with deposits to secure surety, stay, appeal or customs bonds; liens created by or resulting from any litigation or legal proceeding which is currently being contested in good faith by appropriate proceedings; leases and liens, rights of reverter and other possessory rights of the lessor thereunder; zoning restrictions, easements, rights-of-way or other restrictions on the use of real property or minor irregularities in the title thereto; and any other liens and encumbrances similar to those described in this clause (iii), the existence of which does not, in the opinion of the Issuer, materially impair the use by the Issuer or a Subsidiary of the affected property in the operation of the business of the Issuer or a Subsidiary, or the value of such property for the purposes of such business;
(iv) any contracts for production, research or development with or for the Government, directly or indirectly, providing for advance, partial or progress payments on such contracts and for a lien, paramount to all other liens, upon money advanced or paid pursuant to such contracts, or upon any material or supplies in connection with the performance of such contracts to secure such payments to the Government; and liens or other evidences of interest in favor of the Government, paramount to all other liens, on any equipment, tools, machinery, land or buildings hereafter constructed, installed or purchased by the Issuer or a Subsidiary primarily