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2. Future Assault Shell Technology helmet - Wikipedia

   en.wikipedia.org/wiki/Future_Assault_Shell...

   The FAST XR Helmet System released in 2022 represents an intermediate in protection between the SF line of helmets and the RF1 Helmet System, protecting against 7.62×39mm rifle rounds at a distance of 10 feet, but not against larger rounds such as 7.62×51mm. This is due to having a shell thickness of 0.280" (7.112mm).

3. Welding helmet - Wikipedia

   en.wikipedia.org/wiki/Welding_helmet

   A welding helmet is a piece of personal protective equipment used by welders to protect the user from concentrated light and flying particles. Different welding processes need stronger lens shades with auto-darkening filters, while goggles suffice for others.

4. Integrated Visual Augmentation System - Wikipedia

   en.wikipedia.org/wiki/Integrated_Visual...

   The previous helmet-like display was replaced by a flat display with better clarity, better line-of-sight, and also a hinge that allows the display to be flipped up. As a result, the field of view was reduced from 70 degrees to 60 degrees. The thermal camera was also being improved to increase clarity while reducing power consumption. [4]

5. Heating element - Wikipedia

   en.wikipedia.org/wiki/Heating_element

   Silicon nitride has been recently used as a surface igniter for gas furnace and diesel engine glow plugs. Such heating elements or glow plugs reach a maximum temperature of 1400 °C and quickly ignite gasoline or kerosene. The material is also used in diesel and spark ignited engines for other combustion components and wear parts. [19]