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 5965-01-477-6665
NSN 5990-00-538-1237
NSN 2925-01-422-1542
NSN 6610-00-905-6780
NSN 6130-00-465-2965
NSN 6150-01-580-4406
NSN 6645-01-513-0117
NSN 5945-01-521-5080
NSN 6135-01-625-0765
NSN 5920-01-286-1891
NSN 6135-00-542-6216
NSN 6620-01-187-3320