Section 6
SEC. 6. The grantee, with the approval of the Congress of the Philippines first had, may sell, lease, grant, convey, assign, give in usufruct, or transfer this franchise and all property and rights acquired thereunder to any individual, co-partnership, private, public or quasi-public association, corporation or joint-stock company competent to operate the business hereby authorized, but transfer of title to the franchise or any right of ownership or interest acquired under such sale, lease, grant, conveyance, assignment, gift in usufruct, or transfer shall not effective, even after such approval shall have been Stained, until there shall have been filed in the office of the Public Service Commission an agreement in writing by which the individual, co-partnership, private, public or quasi-association, corporation or joint-stock company in whose favor such sale, lease, grant, conveyance, assignment, gift in usufruct, or transfer is made, shall be firmly bound to comply with all the terms and conditions imposed upon the grantee by this franchise and to accept the same, subject to all existing terms and conditions.