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===The Touring Machine===
 
===The Touring Machine===
Feiner and colleagues create the first outdoor AR system, at Columbia University. The Touring Machine (Figure 3) had a see-through HMD, GPS, and orientation tracking. The system needed a backpack with a computer to deliver mobile 3D graphics, various sensors, and an earlier version of a tablet computer for input.<ref name=”3”/>
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Feiner and colleagues created the first outdoor AR system at Columbia University, called the Touring Machine. It had a see-through HMD, GPS, and orientation tracking. The system needed a backpack with a computer to deliver mobile 3D graphics, various sensors, and a version of a tablet computer for input.<ref name=”3”/>
    
===ARQuake===
 
===ARQuake===

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