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 5999-00-242-3390
NSN 5950-01-112-1172
NSN 6150-01-614-0828
NSN 5965-01-178-2367
NSN 6145-01-442-3511
NSN 2925-01-459-8093
NSN 6620-00-760-4332
NSN 5975-00-970-2639
NSN 6105-01-143-7881
NSN 5855-00-361-0167
NSN 5905-00-700-0776
NSN 5905-01-542-8836