Z1CA - MAINTENANCE OF SCHOOLS
Z1CZ - MAINTENANCE OF OTHER EDUCATIONAL BUILDINGS
Z1DA - MAINTENANCE OF HOSPITALS AND INFIRMARIES
Z1DB - MAINTENANCE OF LABORATORIES AND CLINICS
Z1DZ - MAINTENANCE OF OTHER HOSPITAL BUILDINGS
Z1EC - MAINTENANCE OF PRODUCTION BUILDINGS
Z1EZ - MAINTENANCE OF OTHER INDUSTRIAL BUILDINGS
Z1GZ - MAINTENANCE OF OTHER WAREHOUSE BUILDINGS
Z1PZ - MAINTENANCE OF OTHER NON-BUILDING FACILITIES