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 5935-00-225-9032
NSN 5975-01-607-1670
NSN 5965-00-647-3972
NSN 5996-01-587-6985
NSN 5925-00-374-4852
NSN 5950-01-123-6529
NSN 6135-01-359-5798
NSN 5990-01-486-2556
NSN 6130-01-468-9558
NSN 6645-00-890-3226
NSN 5935-01-123-6572
NSN 6320-00-394-8458