31. Cathode ray tubes ( CRTs ) are considered one of the hardest types to recycle.32. Because they don't use bulky, energy-sucking cathode ray tubes , flat-panel displays are slim and light. 33. The indicator display consisted of two cathode ray tubes . 34. The cathode ray tubes in PC monitors are particularly toxic, with lead, mercury and cadmium. 35. In 1897, J . J . Thomson discovered the electron using the cathode ray tube . 36. Because they contain a vacuum ( see Cathode ray tube ), and glass breaks easily. 37. It stored data as electrically charged spots on the face of a cathode ray tube . 38. Its display technology portfolio includes cathode ray tubes for TV and LCD for avionics displays. 39. Notable products of the company included cathode ray tubes for television, starting in the 1930s. 40. By then, the flat panel display may be close to eclipsing the 109-year-old cathode ray tube .
