PUBLIC LAWS-CH. 411-AUG. 3 , 1939 Where securities are to be delivered, etc., on basis of subjection of property to lien. Certificate or opin- ion by independent engineer, etc., to cover fair value. By personnel of obligor, if so provided in indenture. Exception. Recitals as to basis of certificate or opin- ion. pendent engineer, appraiser, or other expert shall not be required with respect to any securities so deposited, if the fair value thereof to such obligor as set forth in the certificate or opinion required by this paragraph is less than $25,000 or less than 1 per centum of the aggregate principal amount of the indenture securities at the time outstanding; and "(3) requiring the obligor upon the indenture securities to furnish to the indenture trustee a certificate or opinion of an engineer, appraiser, or other expert as to the fair value to such obligor of any property the subjection of which to the lien of the indenture is to be made the basis for the authentication and delivery of indenture securities, the withdrawal of cash consti- tuting a part of the trust estate, or the release of property or securities subject to the lien of the indenture, and requiring fur- ther that if "(A) within six months prior to the date of acquisition thereof by such obligor, such property has been used or operated, by a person or persons other than such obligor, in a business similar to that in which it has been or is to be used or operated by such obligor, and "(B) the fair value to such obligor of such property as set forth in such certificate or opinion is not less than $25,000 and not less than 1 per centum of the aggregate principal amount of the indenture securities at the time outstanding, such certificate or opinion shall be made by an independent engineer, appraiser, or other expert and, in the case of the authentication and delivery of indenture securities, shall cover the fair value to the obligor of any property so used or operated which has been so subjected to the lien of the indenture since the commencement of the then current calendar year, and as to which a certificate or opinion of an independent engineer, appraiser, or other expert has not previously been furnished. If the indenture to be qualified so provides, any such certificate or opinion may be made by an officer or employee of the obligor upon the indenture securities who is specified in the indenture, except in cases in which this subsection requires that such certificate or opinion be made by an independent person. In such cases, such certificate or opinion shall be made by an independent engineer, appraiser, or other expert selected or approved by the indenture trustee in the exercise of reasonable care. "Recitals as to Basis of Certificate or Opinion "(e) Each certificate or opinion with respect to compliance with a condition or covenant provided for in the indenture shall include (1) a statement that the person making such certificate or opinion has read such covenant or condition; (2) a brief statement as to the nature and scope of the examination or investigation upon which the statements or opinions contained in such certificate or opinion are based; (3) a statement that, in the opinion of such person, he has made such examination or investigation as is necessary to enable him to express an informed opinion as to whether or not such cove- nant or condition has been complied with; and (4) a statement as to whether or not, in the opinion of such person, such condition or covenant has been complied with. "Parties May Provide for Additional Evidence vide for addition (f) Nothing in this section shall be construed either as requiring evidence. the inclusion in the indenture to be qualified of provisions that the [53 STAT.