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 5999-01-551-0792
NSN 6610-00-498-5198
NSN 5905-01-487-8868
NSN 6220-01-556-7164
NSN 5930-00-948-6684
NSN 6610-01-152-2821
NSN 4140-01-331-0844
NSN 6110-00-200-8465
NSN 5915-01-540-0051
NSN 5855-01-083-1027
NSN 2925-01-482-8202
NSN 5990-00-850-0609