According to Dr. Roman-Lantzy, Cortical Visual Impairment (CVI) âis the leading cause of visual impairment in children today.â CVI differs from other types of visual impairment which are due to physical problems with the eyes. CVI is a neurological disorder caused by damage to the visual centers of the brain, which interferes with communication between the brain and the eyes. The eyes are able to see, but the brain is not interpreting what is being seen.
The bulk of the privately-owned cars were the property of the âbig threeâ leasing companies, General American (GATX), Union Tank (UTLX), and Shippers Car Line (SHPX), with other lessors such as North American (NATX) far down the list.
Tank Development. Richard Edgeworth invented the Caterpillar track in 1770. In the Crimean War a small number of steam powered tractors based on this design proved very successful in the muddy terrain. The development of the modern tank remained dormant until the arrival of the internal combustion engine, patented by Gottlieb Daimler in 1885. In the United States the Holt Company built a tractor with caterpillar tracks that was used to move over difficult territory. Although it was suggested that this machine might be adapted for military use, those in positions of authority failed to see the significance of this new development.