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 6685-00-451-6941
NSN 5998-00-518-5418
NSN 5855-01-154-3871
NSN 5975-01-332-4738
NSN 6685-01-260-0884
NSN 5895-01-063-7400
NSN 4140-01-442-0491
NSN 5965-01-536-2173
NSN 5905-01-460-0657
NSN 6320-00-343-1798
NSN 5960-01-458-7999
NSN 2925-01-288-0971