AN ACT TO AMEND ACT NUMBERED TWENTY-SIX HUNDRED AND FORTY-SEVEN, ENTITLED "AN ACT GRANTING TO MARIANO ABELLA E ISAAC, A FRANCHISE TO INSTALL, OPERATE, AND MAINTAIN AN ELECTRIC LIGHT, HEAT, AND POWER SYSTEM IN THE MUNICIPALITY OF NAGA, PROVINCE OF AMBOS CAMARINES, PHILIPPINE ISLANDS," EXTENDING THE TIME LIMITS THEREIN SPECIFIED.