Do Dunlee's ball tubes have a registration certificate?

Dunlee's tubes are certified.Dunlee is an American company with a long history, founded in 1946. Since its inception, it has successfully developed and manufactured radiographic bulbs and entered the high-end CT market, which was later acquired by Philips at the turn of the century. People recognize Dunlee because of its advanced CT bulb tube technology and its CT replacement bulb tube business from major manufacturers such as GE and Siemens.