Barcode reader
From Memory Alpha, the free Star Trek reference.
A barcode reader was a technology invented by the Chronowerx corporation in the 20th century. Unknown to the general public at the time, the technology it was based on came from a 29th century timeship, the Aeon, which had been stolen by Chronowerx's founder, Henry Starling, in 1967.
Starling cited barcode readers as one technology which, without him, would not have been invented. (VOY: "Future's End, Part II")
