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 6610-01-398-1094
NSN 6145-00-113-6278
NSN 5945-00-794-7957
NSN 6320-00-313-9114
NSN 6620-01-232-8550
NSN 6320-01-054-3046
NSN 5985-01-419-7588
NSN 5965-01-418-7226
NSN 6650-00-736-8456
NSN 5960-00-968-7582
NSN 6650-01-014-5990
NSN 5998-00-596-1377