An early magnetic card storage device from IBM. Used from the mid-1960s until the mid-1970s, the Data Cell was designed by Alan Shugart, who later engineered the hard disk and floppy disk. More than ...

A single-cell battery that is used to power wristwatches, computer clocks, hearing aids and other small devices. Also called a "coin cell," button cells look like small, squat silver cans from five to ...