100. TO BE FILED Within sixty (60) days after the effective date of these rules, each utility shall file with the Commission a true copy of its Service Rules and Regulations, certified by an officer or the manager of the utility to be correct, unless the same have been previously filed pursuant to order of the Commission. If such utility does not have written Service Rules and Regulations in effect upon the effective date hereof, it shall within such sixty-day (60) period so notify the Commission in writing. shall adopt and put into effect written Service Rules and Regulations, and shall file a true written copy thereof, certified as above provided, with the Commission within ninety (90) days after the effective date of these rules.105. MUST BE APPROVED Such Service Rules and Regulations shall be subject to the approval of the Commission. If the Commission finds that changes should be made therein before approval thereof, the utility will be invited to appear and be heard upon any such proposed charges. Thereupon the Commission will approve such Service Rules and Regulations in their original or changed form.