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  BTX_a.jpg - Main page of the BTX festival page. BTX was a V23 online service introduced in 1983 and switched off in 2001. In Austria and Switzerland the service was called "Videotex" (VTX).  
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Main page of the BTX festival page. BTX was a V23 online service introduced in 1983 and switched off in 2001. In Austria and Switzerland the service was called "Videotex" (VTX). Download
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