10 Electroencephalographic system comprised primarily of electroencephalograph, computer software for acquiring, analyzing and presenting electroencephalographic and polysomnographic data, all sold as a unit; medical devices, namely, electroencephalograph and polysomnograph machines consisting of waveform data amplifiers, computers, software, power supplies, and associated cabling and cabinetry for acquiring, analyzing and presenting the data; medical apparatus, namely, amplifiers, computers, software and displays, sold as a unit, for acquiring, analyzing, and presenting data for long-term epilepsy monitoring; medical apparatus, namely, digital polysomnograph apparatus for use primarily in sleep labs of hospitals and clinics comprising amplifiers, data acquisition equipment, a personal computer, associated power supplies and software; medical devices, namely, polysomnograph system comprising personal computer, software and programmable amplifiers; electroencephalographs for monitoring and analyzing brain disorders, polysomnographs for monitoring and analyzing sleep disorders; electrodes for medical use, namely, reusable and disposable electrodes for use with electroencephalographs and polysomnographs