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There was an article in Cycling in the early 1990s about an English or Scots engineer.
He said Campagnolo had contracted him to design an ergopower system. There were pictures of some bits he had made for it. He was annoyed that he had signed over his rights to the design and could not market it himself.
He said two or three other designers had been contracted as well but Campagnolo kept all their identities secret.
He hinted about a non-disclosure agreement. No more was ever revealed.
Sachs used to have rebranded Campagnolo ergo shifters. But they might have had different pull ratio as I think they were Shimano compatible, but 8s pull ratio was close anyway between Campy and Shimano. (look for: New Success Ergo)