McCoy's medical diagnostic thingy would be useful if a little hopeful.

The original flat-screen TV in 2001, showing BBC 12...

Starcops had "Box"

Some of these I knew already, others I've discovered while looking around the web...

In 1887 credit cards were written about in Looking Backward by Edward Bellamy.

Margaret Cavendish was writing sci-fi about underwater vehicles (submarines) in 1666, in a book called The Blazing World.

Ralph 124C 41+ was the first sci-fi book to give us the concept of radar and video phones. That is, Hugo Gernsback was writing about video-chatting in 1911, before television even existed. And radar wasn't properly invented until 1933, but Gernsback describes detecting objects through waves in great detail.

H. G. Wells never went as far with the hard sci-fi tech stuff as Jules Verne did, but his books were just as influential. The War of the Worlds inspired the first liquid-fueled rocket. The Land Ironclads is all about tanks, before tanks were actually invented. But The World Set Free might be his most chilling prediction, because it's a novel about nuclear warfare written in 1914. He actually uses the phrase "atomic bomb," and describes the devastating effects of radiation.

In The Roads Must Roll, Robert Heinlein accurately predicts "electric staircases" that move automatically, as well as those conveyor belt things you walk on at airports. In 1940, Robert Heinlein wrote the short story “Solution Unsatisfactory,” which posited a future world where America develops an atomic weapon that ends World War II unilaterally. After they use it, it spurs the rest of the world into a nuclear arms race to keep up. The story was written before the United States had even entered World War II and five years before the bombing of Hiroshima and Nagasaki. Heinlein’s vision of mutually assured atomic destruction served as a terrifying blueprint for the Cold War.

The characters in Edward Page Mitchell’s “The Senator’s Daughter,” written in 1879, owned printers in their homes, from which they could access and print current articles and information.

Tanks, submarines, helicopters, gliders.....Leonardo was there before all of those Johnny-Come-Lately sci fi authors.