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 6130-00-900-7272
NSN 6150-01-563-5233
NSN 6110-01-339-9977
NSN 5855-01-100-3272
NSN 6320-01-166-3602
NSN 6240-00-462-9026
NSN 5999-01-286-3805
NSN 4140-00-262-8249
NSN 5945-01-634-0588
NSN 6135-01-100-3593
NSN 5950-00-235-2094
NSN 5990-00-931-6304