Wikipedia
Gentex Corporation manufactures automatic-dimming rear-view mirrors and camera-based driver assistance systems for the global automotive industry. The company also provides commercial smoke alarms and signaling devices to the North American fire protection market, as well as dimmable aircraft windows for the commercial, business and general aviation markets. The company is based in Zeeland, Michigan and was founded in 1974. Their mirrors use electrochromism to dim in proportion to the amount of light reaching them from following vehicles' headlamps. The mirrors are available with added electronic features. About 98 percent of the company's net sales are derived from the sale of auto-dimming mirrors to every major automaker in the world.
Gentex is an international standard ( ITU F.20) for the transmission of telegrams over the Telex network. It replaces fixed telegraph connections between stations and means instead that the telegraph station that transmits the telegram connects directly to the receiving station and transmits the telegram with a remote typewriter.
The first official Gentex traffic was introduced in 1956 between the Netherlands, Switzerland, West Germany and Austria. Sweden introduced in 1960 as a test Gentexexpedition with the Netherlands. In 1963 the Nordic countries decided to introduce Gentexexpedition between their countries.