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Sensors | Free Full-Text | Real-Time Back Surface Landmark Determination Using a Time-of-Flight Camera
![File:Opel Astra GTC 1.6 Edition (H, Facelift) – Frontansicht, 29. März 2011, Velbert.jpg - Wikimedia Commons File:Opel Astra GTC 1.6 Edition (H, Facelift) – Frontansicht, 29. März 2011, Velbert.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/f/fe/Opel_Astra_GTC_1.6_Edition_%28H%2C_Facelift%29_%E2%80%93_Frontansicht%2C_29._M%C3%A4rz_2011%2C_Velbert.jpg)
File:Opel Astra GTC 1.6 Edition (H, Facelift) – Frontansicht, 29. März 2011, Velbert.jpg - Wikimedia Commons
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Aerial view, bridge, Angerbachtalbrücke, new motorway section of the A44, gap closure between Ratingen-Ost and Velbert, Heiligenhaus, Ruhrgebiet, Nort Stock Photo - Alamy
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Aerial view, bridge, Angerbachtalbrücke, new motorway section of the A44, gap closure between Ratingen-Ost and Velbert, Heiligenhaus, Ruhrgebiet, Nort Stock Photo - Alamy
![Album amicorum of Rosalie Könings, mainly Velbert and Elberfeld, German, 1838-1849, containing 21 contributions of which 19 manuscripts (3 with mounted piece of braided hair), 1 coloured drawing and 1 "knipkunst" guirlande. Album amicorum of Rosalie Könings, mainly Velbert and Elberfeld, German, 1838-1849, containing 21 contributions of which 19 manuscripts (3 with mounted piece of braided hair), 1 coloured drawing and 1 "knipkunst" guirlande.](https://d3525k1ryd2155.cloudfront.net/h/808/581/1336581808.0.x.jpg)