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 5835-01-412-0344
NSN 5930-00-406-4209
NSN 6105-00-456-9829
NSN 6145-01-076-8202
NSN 5915-01-032-6995
NSN 5996-01-360-7116
NSN 6130-01-542-9901
NSN 5855-01-400-1590
NSN 5915-01-175-0190
NSN 6110-01-042-3110
NSN 6220-01-122-3155
NSN 5998-01-649-8821