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A german company that produced the [[Wiedmann BTX Modul]] for CPC or Schneider Joyce. Wiedmann is listed as provider for some Amstrad support/spares on Cliff Lawson's semi-official Amstrad page, http://web.ukonline.co.uk/cliff.lawson/.
The company does still exist in 2010, and they do even still have [[Schneider]] and [[Amstrad]] logos on their webpage: http://www.wiedmann.com - however, they seem to be focusing on older (pre-computer) hardware now, see screenshots below.
