Section 7
SEC. 7. All telecommunications systems owned, operated or maintained by the grantee, its successors or assigns shall be maintained and operated at all times in a satisfactory manner, and it shall be the further duty of said grantee, its successors or assigns, whenever required to do so by the National Telecommunications Commission, to modify, improve and change such telecommunications systems in such manner and to such extent as the progress of science and improvements in the method of conveyance of telecommunications messages by means of said systems may make reasonable, proper and economically feasible.