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| nco:ModemNumbernco:ModemNumber | 
A modem phone number. Inspired by the (TYPE=modem) parameter of the TEL property as defined in RFC 2426 sec 3.3.1.
    http://www.w3.org/2000/01/rdf-schema#Resource 
        nco:ContactMedium 
        ╰── nco:PhoneNumber 
            ╰── nco:ModemNumber 
                ╰── nco:BbsNumber