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 5996-01-386-4230
NSN 4140-00-336-1728
NSN 5985-00-176-1499
NSN 5996-01-212-3066
NSN 5945-01-374-9283
NSN 6220-00-147-7064
NSN 5855-01-270-6847
NSN 5930-01-077-2944
NSN 5925-00-938-7370
NSN 4140-01-111-2486
NSN 6220-00-116-5689
NSN 5990-00-116-6590