Section 3
SEC. 3. Section two of the same Act is hereby amended to read as follows: "SEC. 2. This temporary permit shall continue to be in force during the time that the grantee, successors or assigns, conducts its business or services at the places selected by the grantee but in no case to go beyond July four, nineteen hundred seventy-four, and is granted upon the express condition that the same shall be void unless the construction, installation of at least two radio stations be begun within two years from the date of the approval of this Act."