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
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.
The automatic player piano was invented by Heneri Fourneaux in the year 1863. =]