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 6135-01-244-5580
NSN 4140-01-387-2068
NSN 5935-01-281-4388
NSN 5950-01-619-0938
NSN 5965-01-045-0247
NSN 6110-01-098-8273
NSN 5945-01-461-8143
NSN 6135-00-422-3967
NSN 7035-00-483-3663
NSN 5945-01-116-5472
NSN 5935-01-187-4911
NSN 5990-00-112-2440