A chart especially prepared for checking overall performance of a television system. Television standards conversion is the process of changing one type of television system to another. In January 2008, Comcast took control of the cable television system. Many inexpensive consumer television system converters have employed this technique. The channels originated as part of the groundbreaking interactive cable television system known as QUBE. Lansford was the home of the first Commercial Cable Television system in the United States. Visitors may see some of the property's bats on a closed-circuit television system. It has aired on Chinese Television System many times. The hall is fitted with a public address system and a closed circuit television system. Holzman guided the company into home video and the first interactive cable television system, QUBE. The series is broadcast in Canada through the CTV television system. In Canada, the show aired on Crossroads Television System. Gray conceived of a primitive closed-circuit television system that he called the "telephote". In 1941, the first NTSC standard was introduced by the National Television System Committee. The transmission was a test of General Electric's 48-line television system and lasted 40 minutes.