Section 6
SEC. 6. This franchise is granted subject to the provisions of the Constitution and Commonwealth Act Numbered One hundred forty-six, as amended, and with the understanding and upon the condition that it shall be subject to amendment, alteration or repeal by the Congress of the Philippines when public interest so requires, and that it shall be subject to the pertinent provisions of Act Numbered Fourteen hundred fifty-nine, as amended. The Public Service Commission shall prescribe as a condition for the issuance of the certificate of convenience and public necessity to the grantee that the certificate shall be valid only for a definite period of time and that the violation of any of these conditions shall cause the immediate cancellation of the certificate without the necessity of any express action on the part of the Commission.