This page scrapbooks links to text phones found searching EDT - European Deaf Telephone.
The browser's ability to translate really helps me!
https://de.wikipedia.org/wiki/Schreibtelefon - useful wiki page that explains the history.
https://tap.gallaudet.edu/Text/TTYBasics.html - Brief History of TTY
The page above mentions the vistel 1 and teh science museum has this in the catalogue.
https://sfdh.org.uk/topic/technology/
EDT is an option in the IYU V.18 spec.
I did a search for European Deaf Telephone (EDT) and came up with some interesting links.
A spanish web page:-
A Dutch web page:-
https://teksttelefon.no/static/informasjon-om-teksttelefonen.html
Really good Dutch webpage that has good phone diagrams and notes on DTMF used on some Textphones.
https://www.robkalmeijer.nl/techniek/telecom/telefonie/index.html
He has this diagram of a phone. You can see the Bell , hook switch, rotary dial, the Anti-sidetone hybrid Microphone and receiver with Anti- Acoustic shock diodes.
German examples:-
https://commons.wikimedia.org/wiki/Telecommunications_device_for_the_deaf?uselang=de
https://de.wikipedia.org/wiki/Schreibtelefon
Ultratec seems to be very popular in America. It does CCITT BAUDOT
https://oldcomputer.info/terminal/minicom/index.htm
https://www.wikiwand.com/en/articles/Telecommunications_device_for_the_deaf
https://deafwebsites.com/technology/telecommunications-devices-for-the-deaf/
pay phone with TTD
https://www.ghe.ch/admin/uploads/SpezifikationenDocs/6/Telescrit%202002,2008%20d%20neu.pdf
In the UK -
https://www.relayuk.bt.com/ - The UK Relay site run by BT.
https://www.dspg.co.uk/products-services/accessibility/
RTTY - uses BAUDOT codes
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