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The Sword of Damocles (virtual reality) - Wikipedia
Helmet-mounted display - Wikipedia
Head-mounted display - Wikipedia
VR @ 50: Ivan Sutherland’s 1968 Head-Mounted 3D Display …
History Of Virtual Reality
A Brief History of Virtual Reality: Major Events and Ideas
Meet the Sword of Damocles, the First VR Headset in the World
The History and Science of Virtual Reality Headsets
History of Virtual Reality (VR) – VR.org
The History Of Virtual Reality - Tom's Hardware