File:Ivan Sutherland's head-mounted display with ultrasonic tracking system.jpg

Summary[edit]

Here under fair use. It is fair use because it provides a benefit that did not exist in the prior work, which was a note that it is a photo including the ultrasonic tracking system.

This photo is of the headset with an ultrasonic tracking system.

https://immersivearchive.org/ivan-hmd.html

Apparent source: https://lavalle.pl/vr/hmd.html