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 6685-01-513-3737
NSN 2925-01-283-6740
NSN 5905-01-235-7868
NSN 6620-01-376-3744
NSN 2925-01-076-5219
NSN 5950-01-105-5768
NSN 6150-01-338-5679
NSN 5930-01-430-0144
NSN 5835-01-231-4994
NSN 6105-01-249-4919
NSN 6145-00-019-0047
NSN 5855-01-373-7538