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Electronic personal organizers capable of transmitting and receiving data to and from telecommunication and data- processing apparatus; personal computers capable of transmitting and receiving data to and from telecommunication and data- processing apparatus; handheld computers capable of transmitting and receiving data to and from telecommunication and data- processing apparatus; PDA (personal digital assistants) capable of transmitting and receiving data to and from telecommunication and data-processing apparatus; components and peripherals of these; computer software for use in data transmitting and data receiving