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 6150-01-486-3037
NSN 6135-01-633-8502
NSN 6650-01-446-1160
NSN 6320-01-139-0533
NSN 6645-00-273-1203
NSN 5945-00-901-4485
NSN 5905-00-262-5645
NSN 5996-01-444-1488
NSN 2925-01-459-8093
NSN 6220-01-429-9538
NSN 5895-01-143-0822
NSN 5925-00-447-3500