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 6320-01-476-7702
NSN 5905-01-633-0210
NSN 5915-00-920-6700
NSN 6150-01-445-2406
NSN 5999-01-048-3606
NSN 6620-01-442-8444
NSN 5855-01-384-3314
NSN 5920-00-413-3341
NSN 2925-00-051-1467
NSN 5945-01-454-6166
NSN 6135-00-575-8942
NSN 5895-00-050-2044