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 6650-01-596-1365
NSN 6610-01-291-4173
NSN 5999-01-009-1503
NSN 6645-00-073-9949
NSN 6645-00-492-9487
NSN 6610-01-612-0157
NSN 6135-01-049-5980
NSN 6620-01-133-4193
NSN 6320-00-456-0836
NSN 5855-01-486-9924
NSN 5996-01-195-3583
NSN 6610-00-623-5783