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 5999-01-190-5213
NSN 5925-01-294-2408
NSN 6130-00-877-5743
NSN 6130-00-356-1702
NSN 6620-00-450-5703
NSN 5920-01-116-4236
NSN 5855-01-232-9440
NSN 5915-00-636-4238
NSN 6150-01-415-9874
NSN 5835-01-198-6814
NSN 5915-01-133-5911
NSN 6135-01-459-6424