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Lighting Installation - Basic vocational knowledge (Institut für Berufliche Entwicklung, 164 p.)
11. Inspection and Repair of Lighting Installations
11.1. General Remarks
11.2. Depreciation Factors
11.3. Time of Maintenance
11.4. Carrying out of Maintenance
11.5. Cleaning
11.6. Auxiliary Means for Maintenance
11.7. Hints for Practice