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Video technology was first developed for cathode ray tube (CRT) television systems, but several new technologies for video display devices have since been invented. Charles Ginsburg led an Ampex research team developing the first practical video tape recorder (VTR). In 1951 the first video tape recorder captured live images from television cameras by converting the camera’s electrical impulses and saving the information onto magnetic video tape. This tape was sold for around $50,000 in 1956. Sony began selling videocassette recorder (VCR) tapes to the public in 1971. Later advances in computer technology have allowed computers to capture, store, edit and transmit video clips. After the invention of the DVD in 1997 and Blu-ray Disc in 2006, sales of video tape and tape equipment plummeted.