1645
The first portable DVD players were introduced in 1998 by Panasonic. While newer portable DVD players have an average screen size of 7 inches, the first portable DVD player's screen was only 5 inches.
1979
he invented portable dental x ray machines in the year 1921
You Better Come Back With A Sandwich
The first record player, known as the phonograph, was invented by Thomas Edison in 1877. It was capable of recording and playing back sound using a cylinder. The flat disc format we associate with modern record players emerged later, with Emile Berliner's gramophone patenting the flat disc record in 1887.
1887
1982.
It was made in 1 bc
The Sony Walkmans come with a two-year warranty, but the player should last much longer.
The first portable watches were invented in the 16th century. The earliest known watch dates back to 1530s and gradually evolved from spring-powered clocks.
Original insulation was invented in 1893. The individual who invented it was John Player. Fiberglass insulation wasn't invented until 1897.
Alan Blumlein is the inventor of the stereo. Blumlein invented the first stereo in 1931. Many of his developments on the stereo did not reach completion until 1935.