A pendulum controls the clock’s ticking. The principle stems all the way from Galileo Galilei. An ornate pendulum clock was standard in many Swedish living rooms in the 1930s.
Bluetooth technology has been around since 1999. It enables wireless communication between a sender and receiver (for instance, a mobile phone and a headset, or a mobile phone and a car stereo). The technology is a joint venture between Ericsson, IBM, Toshiba, Nokia and Intel. The name came from Harald Bluetooth, a Danish Viking king who united Denmark and Norway and was a good speaker. The project group took the name as they worked across countries and in harmony. (From the catalogue 2004.)
A hand-driven sander with cog wheels that had to be secured to a flat surface before use. (From the catalogue 1926.)