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 5920-01-325-0286
NSN 5950-01-025-1649
NSN 6150-00-548-0387
NSN 5965-00-100-1291
NSN 5999-01-401-5322
NSN 5965-01-631-2722
NSN 4140-01-061-9849
NSN 6650-01-039-4795
NSN 5905-00-614-3775
NSN 2925-00-005-1618
NSN 6220-01-146-2838
NSN 5905-00-115-2288