Each obligor upon the indenture securities shall furnish or cause to be furnished to the institutional trustee thereunder at stated intervals of not more than six months, and at such other times as such trustee may request in writing, all information in the possession or control of such obligor, or of any of its paying agents, as to the names and addresses of the indenture security holders, and requiring such trustee to preserve, in as current a form as is reasonably practicable, all such information so furnished to it or received by it in the capacity of paying agent.