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 4140-01-378-6710
NSN 5910-01-411-5366
NSN 5920-01-200-9318
NSN 5835-01-107-8600
NSN 5960-01-342-1961
NSN 5985-01-443-5681
NSN 5910-01-294-9434
NSN 5835-01-498-9410
NSN 5965-01-521-4452
NSN 6645-00-819-5045
NSN 5835-01-495-0595
NSN 5895-01-448-9587