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 6110-01-298-4664
NSN 6240-01-364-0815
NSN 2925-01-004-5627
NSN 6145-00-793-7816
NSN 5945-00-908-4956
NSN 6650-01-477-2124
NSN 6610-01-254-4196
NSN 5905-01-196-9593
NSN 5960-01-605-9921
NSN 6650-01-250-8701
NSN 5910-00-398-0930
NSN 6110-00-690-9901