Installation, maintenance and repair of biomedical / hospital equipment; Maintenance and servicing of medical imaging apparatus used in medical imaging centers; Maintenance and/or repair of biomedical / hospital equipment; Maintenance of medical apparatus and instruments; Repair or maintenance of electric lighting apparatus; Repair or maintenance of freezing machines and apparatus; Repair or maintenance of laboratory apparatus and instruments; Repair or maintenance of measuring and testing machines and instruments; Repair or maintenance of medical machines and apparatus