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 6620-01-083-4672
NSN 5905-01-346-1717
NSN 5855-01-013-6864
NSN 4140-01-622-6837
NSN 6320-01-450-5040
NSN 6135-01-210-8715
NSN 6620-01-073-6365
NSN 6110-01-150-7520
NSN 6130-01-149-7595
NSN 5915-01-527-2088
NSN 6110-01-348-7424
NSN 5835-01-504-0837