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 5910-00-822-5270
NSN 5905-00-226-5561
NSN 5985-01-443-8591
NSN 6620-00-905-6590
NSN 5895-01-391-5068
NSN 5905-01-080-8926
NSN 5895-00-904-7839
NSN 5855-00-990-0701
NSN 5945-01-529-1182
NSN 6150-01-408-2092
NSN 6105-01-534-5360
NSN 4140-01-588-2088