I saw a mid 80s Olmo with 3TTT bars that had barend lever cables routed through the bars, with holes on either side of the stem. I seem to remember this as one of the first solutions to aero lever cable routing. Though the holes looked kind of ragged on these bars.
Don't know how much I'd trust them.
Steven M. Johnson, Chesapeake, VA http://members.home.com/grisha1/index.htm