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 6150-01-449-0720
NSN 5996-01-202-5092
NSN 5990-01-514-8708
NSN 5999-00-377-3765
NSN 5835-01-347-6362
NSN 6220-01-150-4920
NSN 6135-01-101-5039
NSN 6150-01-460-0674
NSN 5945-00-362-0188
NSN 5960-01-485-2467
NSN 5945-01-044-5291
NSN 5925-01-550-9653