Campagnolo delta brake calipers were in production as Campagnolo's top level offering from 1984-1993 with a two year hiatus when the first generation was recalled (1985-86 with the Cobalto brakeset used as an interim replacement). When the delta brakeset was reintroduced in 1987 it took another 7 years and a further 4 generations to work out that the concept simply didn't work.
In 1993 Campagnolo came out with these prototype dual pivot calipers:
mmm... p r o t o t y p e...
Currently on ebay for USD $299
ADDIT: sold 23/5/11