Maintenance and repair services in connection with machines, apparatus and instruments for use in the electronics, micro-lithography, semi-conductor, integrated circuit, magnetic domain memories and integrated optical systems industries; repair of scientific, research, navigational, surveying, photographic, cinematographic, audiovisual, optical, weighing, measuring, signalling, detecting, testing, checking, life-saving and teaching apparatus and instruments, apparatus and instruments for conducting, switching, transforming, storing, regulating or controlling the distribution or use of electricity, apparatus and instruments for recording, transmitting, reproducing or processing sound, images or data, computer software, mechanisms for money-operated apparatus, cash registers, calculators, computers, computer peripherals, spectacle lenses, spectacles, microscopes, surgical microscopes, binoculars, riflescopes, spotting scopes, night vision devices, lenses, planetariums, planetarium projectors; repair, installation, maintenance, rebuilding, upgrading, retrofitting and refurbishing services in the field of medical equipment, including computer hardware, data processing equipment and optical instruments; technical phone and live chat support services, namely, providing advice regarding maintenance and repair of computer hardware, data processing equipment and optical instruments for professionals in the fields of healthcare; installation, updating, maintenance of computer hardware