SECTION 1. Section five of Republic Act Numbered Fifty-one hundred and six is hereby amended to read as follows:
"SEC. 5. If the grantee shall not commence the manufacture and distribution of ice in the municipalities of Bayugan and Prosperidad, Province of Agusan, within four years from the approval of this Act, unless prevented by an act of God or force majeure, martial law, riot, civil commotion, usurpation by a military power or any other cause beyond the grantee's control, this franchise shall be null and void."