A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 5965-00-057-6944
NSN 5985-01-415-3866
NSN 5935-01-210-9156
NSN 5985-01-372-0282
NSN 6150-01-305-5334
NSN 6650-01-361-9336
NSN 2925-01-359-4027
NSN 5905-01-116-1767
NSN 6645-01-039-4259
NSN 6135-00-816-6206
NSN 6135-00-823-3034
NSN 6650-01-288-8279