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 6135-01-045-1504
NSN 6220-00-985-3465
NSN 5945-01-295-4495
NSN 5920-01-492-2893
NSN 5990-01-116-2181
NSN 5835-00-275-0584
NSN 4140-00-051-3296
NSN 5996-01-432-2779
NSN 6105-01-381-1088
NSN 5945-00-597-5722
NSN 7035-01-472-1999
NSN 5925-01-457-5668