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 5910-01-431-5825
NSN 5950-01-317-3891
NSN 6110-00-816-9715
NSN 5925-01-101-7547
NSN 5910-01-257-3539
NSN 5985-01-027-0225
NSN 6650-00-461-9027
NSN 5985-01-085-6288
NSN 5935-01-337-9728
NSN 6240-01-058-1777
NSN 6685-00-226-7095
NSN 6130-01-070-5508