(subclass Correspondence Document) | Media.kif 952-952 | Correspondence is a subclass of document |
(subclass Letter Correspondence) | Media.kif 953-953 | Letter is a subclass of correspondence |
(subclass FaxMessage Correspondence) | Media.kif 1010-1010 | Fax message is a subclass of correspondence |
(subclass EmailMessage Correspondence) | Media.kif 1028-1028 | Email message is a subclass of correspondence |