Revision as of 20:54, 14 January 2013 by Administrator1
Includes postal services and voice mail.
- Postal services - the services used to transmit physical objects and tangible letters across space
- Voice mail - a computer based system that allows users to exchange voice messages
This category has only the following subcategory.
Pages in category "Message systems"
The following 4 pages are in this category, out of 4 total.