Category:Message systems

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Includes postal services and voice mail.

Subcategories

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

Subcategories

This category has only the following subcategory.

P

Postal services

Pages in category "Message systems"

The following 4 pages are in this category, out of 4 total.

F

Milestones:First Breaking of Enigma Code by the Team of Polish Cipher Bureau, 1932-1939

I

Milestones:International Standardization of G3 Facsimile, 1980

K

Robert Kahn

W

Education:What's the real message?

Media in category "Message systems"

The following 2 files are in this category, out of 2 total.

Fig05-SiemensKarolusFacsimileSystem1927 0622.jpg 1,731 × 2,170; 584 KB
Message Systems Morse code in British signal exchange Somme 1916.jpg 766 × 599; 74 KB

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Communications