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 6145-00-815-5032
NSN 6110-00-880-6376
NSN 5915-01-400-6125
NSN 5935-00-615-6599
NSN 2925-00-596-9775
NSN 6130-01-113-2529
NSN 5998-01-030-2835
NSN 5905-01-252-6014
NSN 5930-01-205-1583
NSN 6135-00-990-1822
NSN 5835-01-453-3074
NSN 5855-01-147-4785