3. Electrical Facilities, Underground Distribution Systems, Repairs and Utilities (TM5-680D) 4. Electrical Facilities, Generating Plants, Repairs and Utilities (TM5-680G) 5, Common-battery Telephone Equipment (TM11-458) 6, Central Office Maintenance (TM11-473) 7, Electrical Communication Systems Engineering (TM11-486) SPECIAL MAINTENANCE AND OPERATION INSTRUCTIONS The following series of instructions were prepared bythe 4-E-C-M and are reproduced herewith because it is felt that they are peculiar to the type, nature, and location of this operation and that they might be of value in connection with future similar operations. O~2