Dunno if this is still relevant, but it's from a 2003 Velo News article:
http://www.velonews.com/tour2003/tec...es/4588.0.html

"Even more interesting was the number of teams using tubular tires bearing brands of companies that don't make tubular tires. Although it's never done in public, some tire manufacturers (and saddle makers as well) have portable hot-patch machines that roll their logos onto a competitor's blacked-out tires. For example, Hutchinson doesn't make a tubular, but Hutchinson-supported teams all sported "Hutchinson" tires - even though most of the tires I saw were Vittoria Pro CXs.


I still don't think they make a tubular:
http://tires.hutchinson.fr/uk/velo/accueil.php

Last year 3 teams used Hutchinson tubeless tyres:
http://www.velonews.com/tour2004/tec...es/6450.0.html