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 5895-01-606-9459
NSN 5920-01-214-0451
NSN 5945-01-502-5961
NSN 5975-01-010-2953
NSN 5935-01-167-4145
NSN 5975-01-543-9320
NSN 6320-01-017-5274
NSN 6320-01-198-4024
NSN 6240-00-916-8226
NSN 5965-00-196-7320
NSN 4140-01-264-0885
NSN 5935-00-890-4452