Bennet Oscillator

The Bennett oscillator was a device used in spacecraft and space stations.

A space shuttle in 2049 had a prototype version of the Bennett oscillator. (TV: Kill the Moon)

The First Doctor wondered if Bennett was related to the inventor of the Bennett oscillator. (PROSE: The Rescue)

Nerva Beacon was built with a modified version of the Bennett oscillator in the late 29th or early 30th century. The Fourth Doctor was able to judge the date of construction based on the presence of the oscillator and a macro-slave drive. (TV: The Ark in Space)