Those are classic ultrashift or whatever they called them in 2001 levers. They use the same basic mechanism in use form 2000-2005. The front is a micro-space ratchet, whereby you trim as needed (never counted the clicks) and will work with just about any front double or triple derailleur, since it isn't indexed.

FYI, because the clicks are finer, the spring flex when shifting is much less, and the springs therefore last much longer (plus most folks don't shift the front as often as the rear). When I was a Campy service tech, I serviced one left for every 20 rights.