[GreenKeys] Development of RTTY technology?

[John Foust]

I received this inquiry to my web site www.threedee.com/jcm 
and I thought I'd forward it to the experts on this list...
Please reply to Christian.

- John

Date: Wed, 28 Jul 2004 16:44:40 -0700
From: Christian Wirth <radman at gmail.com>
To: jfoust at threedee.com
Subject: Larger teletype art images
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Hello,

I'm trying to straighten something out, perhaps you can help me with
this, regarding teletypes and HAM radios.

According to my research:

1855: Morse debuts the first Teletype: a glass-domed stock-market ticker.
1876: The first Teletypewriter is used on Telegraph lines. 
1923: First evidence of character/text-based artwork transmitted
remotely, via Teletype networks.

**WHAT HAPPENED?** What year was the technology invented to permit
Teletypes to communicate over radio?  I can't find a single link to
this!  It's frustrating, but maybe you know right away where I can
find this information.  I've read that RTTY was available as early as
1925 but no explanation as to how it came around, etc.

1970s: Text-based artwork is sent from via radio waves using the Radio
Teletype (RTTY).