I hope that Johannes Gutenberg would have the good grace to admit that he did not invent printing with moveable type! Even the Gutenberg Museum (in Mainz, which I visited last year) recognises that Bi Sheng did so, hundreds of years earlier.
Even recent inventors, such as John Bardeen (who died in 1991) and Walter Brattain (who died in 1987) might be stunned to see where their invention has led us to. They were the co-inventors of the transistor, without which the 'electronic revolution' could never have taken place. They were around to see the beginnings of personal computers and devices such as bank ATMs, yet they might still be amazed at the rise of the internet, mobile phones, PDAs, media players, debit cards, bar code technology, electronic management of car engines, digital TV, MRI scanners and the thousands of other applications which wouldn't exist without their work. (They were awarded the Nobel prize but, amazingly, hardly anyone seems to know about one of the most important inventions ever!).
Chris