History. A carbon filament lamp using to prevent darkening of the envelope was patented in 1882, and -filled "NoVak" lamps were marketed in 1892. The use of iodine was proposed in a 1933 , which also described the cyclic redeposition of tungsten back onto the filament. In 1959, General Electric patented a practical lamp using iodine.
Hot Crushers Brief Introduction
We are a professional mining machinery manufacturer, the main equipment including: jaw crusher, cone crusher and other sandstone equipment;Ball mill, flotation machine, concentrator and other beneficiation equipment; Powder Grinding Plant, rotary dryer, briquette machine, mining, metallurgy and other related equipment.If you are interested in our products or want to visit the nearby production site, you can click the button to consult us.
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